HBr lewis structure, Characteristics: 51 Complete Quick Facts


HBr is the chemical formula of hydrogen bromide. We are learning here about HBr lewis structure, characterizations and quick facts.

Hydrogen bromide is an anhydrous gas with no colour having strong irritating smell. It is corrosive in nature and heavier than air. HBr molecule contains one hydrogen atom and one bromine atom in its structure. The molecular weight of HBr is 80.91. HBr has synonyms like bromane, hydrobromic acid, hydrobromide, etc.

How to draw HBr lewis structure?

Steps to draw HBr lewis structure as follows:

  1. Determine the H and Br position in periodic table group and evaluate total valence electrons on HBr molecule.
  2. Most electronegative atom is at central position and makes bonding within H and Br atoms.
  3. After bonding remaining electrons put on bonding atoms and mark lone electron pairs.
  4. Check the octet of H and Br complete or incomplete.
  5. Evaluate formal charge of HBr lewis structure.
  6. Recognize shape, hybridization and bond angle of HBr lewis structure.
HBr lewis structure

HBr valence electrons

In HBr lewis structure, H atom and Br atom belongs to 1st and 7th periodic table group respectively. Thus, both H and Br having 1 and 7 valence electrons in its valence shell. So, the total valence electrons in HBr lewis structure are:

Valence electrons of hydrogen atom = 1

Valence electrons of bromine atom = 7

Total valence electrons of HBr lewis structure = 1 (H) + 7 (Br) = 8

Therefore, HBr lewis structure has total eight valence electrons.

To fine total electron pairs on HBr lewis structure just divide total HBr valence electrons by 2.

So, total electron pairs = 8 / 2 = 4

Hence, total electron pairs of HBr lewis structure is four.

Valence electrons in HBr lewis structure

HBr lewis structure octet rule

HBr lewis structure has one valence electron on H atom and seven valence electrons on Br atom, thus having total eight valence electrons. The one valence electron of H atom gets shared with one electron of Br atom forming single covalent bonds.

The remaining six valence electrons go to the Br atom. Therefore, H atom gets satisfied its valency of two max electrons and Br atom has complete octet due to the presence of eight electrons in HBr lewis structure.

HBr lewis structure has bromines complete octet

HBr lewis structure lone pairs

The HBr lewis structure has total eight valence electrons from them two electrons are being bond pairs and six electrons are non- bonding electrons on bromine atom. These six non- bonding electrons are being three lone electron pairs on bromine atom of HBr lewis structure. Thus, the HBr lewis structure has three lone electron pairs.

Three lone electron pairs on HBr lewis structure

HBr lewis structure formal charge

On any lewis structure is being stable if there is minimum formal charge is present on it. There is a formula to evaluate the formal charge of any lewis structure.

Formal charge = (valence electrons – non-bonding electrons – ½ bonding electrons)

To evaluate formal charge of HBr lewis structure, first count formal charge of hydrogen and bromine atoms separately.

Hydrogen atom: Hydrogen atom valence electrons of HBr = 01

                           Hydrogen atom non- bonding electrons of HBr = 00

                              Hydrogen atom bonding electrons of HBr = 2 (single bond = 2 electrons)

Formal charge of Hydrogen atom is = (01 – 00 – 2/2) = 0

So, the hydrogen atom on HBr lewis structure has zero formal charge.

Bromine atom: Valence electrons on Bromine atom of HBr = 07

                         Non- bonding electrons on Bromine atom of HBr = 06

                            Bonding electrons on Bromine atom of HBr = 02 (2 electrons in single bond)

Formal charge on bromine atom is = (7 – 6 – 2/2) = 0

So, the bromine atom of HBr lewis structure has zero formal charge.

Hence, the H and Br atoms of HBr lewis structure has zero formal charge.

hbr lewis structure
HBr lewis structure has zero formal charge

HBr lewis structure resonance

HBr lewis structure cannot form any resonance structure as it does not obey the rule of resonance structure. HBr lewis structure has do not have any multiple bonds and formal charge but it has three lone electron pairs. So, there is no possible movement of electrons in HBr lewis structure to form multiple bonds.

HBr lewis structure shape

According to VSEPR theory the HBr lewis structure has AXE3 generic formula where, A = central atom, X = bonding atom to central atom, X = lone electron pairs on bonding atoms. So, the HBr lewis structure has one central H atom, one bonding Br atom and three lone electron pairs on Br atom. Thus, HBr lewis structure has linear molecular shape and tetrahedral electron geometry.

HBr lewis structure shape

HBr hybridization

As the HBr lewis structure follows the AXE3 generic formula of VSEPR theory, so it has linear molecular shape and tetrahedral electron geometry. Because the HBr lewis structure has one hydrogen atom bonding with one bromine atom and Br atom has three lone electron pairs. Thus the HBr lewis structure has sp3 hybridization.

HBr lewis structure angle

The HBr lewsis structure comes under AXE3 generic formula of VSEPR theory. According to which it has linear molecular shape and tetrahedral electron geometry with sp3 hybridization. Thus, the HBr lewis structure has 109.5 degree bond angle.

HBr solubility

Hydrogen bromide (HBr) is soluble in:

  • Water
  • Acetic acid
  • Some other organic solvents

Is HBr soluble in water?

Yes, HBr is soluble in water. It gets dissociated in water as ions i.e. H+ and Br- ions.

Why HBr soluble in water?

When HBr gas added in water it get ionises as H+ (hydrogen ion or proton) and Br- ions. Hence it increases the H+ ions concentration in water and forms H3O+ (hydronium) ion in water.

How HBr soluble in water?

HBr (hydrogen bromide) gas reacts with water and forms HBr (hydrobromic acid) liquid. The hydrogen atom of HBr molecule forms hydrogen bonds with electronegative oxygen atom of water (H2O) molecule. Thus, HBr on mixing with H2O get dissociates as H+ and Br- ions and forms H3O+ ions.

HBr → H+ + Br-

HBr + H2O → H3O+ + Br-

Hydrogen bonding in HBr and water

Is HBr an electrolyte?

Yes, HBr (hydrogen bromide) is an electrolyte, rather HBr is a strong electrolyte. HBr when mixed with water it gets completely dissociated into water.

Why HBr is electrolyte?

HBr is an strong electrolyte. Electrolyte is a substance which when dissolve in water get ionizes and conduct electricity. HBr is an strong electrolyte because when it dissolve in water it get ionizes as positively charged cations H+ ions and negatively charged Br- anions and it can conduct electricity.

How HBr is a electrolyte?

When HBr (hydrogen bromide) get mixed with water it get dissociates into H+ (cation) and Br- (anion). When the electric current applied into the electrolytic solution like HBr + H2O, the H+ and Br- ions get formed and the positively charged H+ ions moves towards cathode and Br- ions moves towards anode.

Is HBr a strong electrolyte?

Yes, HBr is a strong electrolyte. Electrolytes are the compounds which get dissolved in water and forms ions to conduct electricity. Strong electrolytes are the compounds which get completely ionized into water to conduct electricity. In HBr (hydrogen bromide) when mixed with water get ionised into H+ and Br- ions i.e. completely ionizes and conduct electricity.

Is HBr acidic or basic?

Yes HBr is acidic in nature. HBr behaves as acid as when it dissolved in water it get ionizes a s H+ and Br- ions. Acids are the compounds which liberates H+ ions (protons) into water solution.

Why HBr is acidic?

When HBr gas mixed in water it get completely dissociated into H+ and Br- ions and thus it is behaves as strong acids. It get completely dissociates into water thus considered as strong acid.

How HBr is acidic?

HBr on mixing with H2O get dissociated into H+ and Br- ions and then the H+ ions further reacts with water molecules to form H3O+ ions. Hence, HBr is behaves as acid.

HBr + H2O → H3O+ + Br-

Is HBr a strong acid?

Yes, HBr is a strong acid. When HBr (hydrogen bromide) dissolved in water which gets completely dissociates or ionizes as H+ and Br- ions. As HBr molecule get completely ionizes into water hence it is a strong acids. The compounds or substance produce H+ ions into water by ionizing completely are strong acids.

Is HBr polyprotic acid?

No, HBr is not a polyprotic acid rather it is a mono- protic acid in nature. Monoprotic are the acids which contain only one hydrogen atoms or H+ ions or protons in its molecule. Polyprotic are the acids which contain more than one hydrogen atoms or H+ ions or protons in its molecule.

The HBr (hydrogen bromide) compound consists of one hydrogen atom and one bromine atoms only. Thus, HBr molecule on reaction with water can produce or release or dissociated only its one hydrogen atom or H+ ion or protons. Hence, HBr is monoprotic molecule.

Is HBr a lewis acid?

Yes, HBr is a lewis aicd. Lewis acids are those which have capability to accept a lone electron pairs. In lews acids the molecule should has at least one empty orbital in their valence shell in its atoms. The HBr is an lewis acid, because it has the capability to accept protons from water molecules when dissolve in water.

Why HBr is a lewis acid?

HBr is behaves as a lewis acid because it has the capacity to accept a pair of electrons.

How HBr is a lewis acid?

HBr when reacts with water can accepts a pair of proton (H+) from water molecules and hence HBr can acts as a lewis acid.

Is HBr an arrhenius acid?

Yes, HBr is an Arrhenius acid. Arrhenius acids are the species or compounds which can increases the concentration of H+ ions (protons) in the solution.

Why HBr an Arrhenius acid?

The HBr when mixed with water, the bond get breaks between the H and Br atoms and thus forms H+ ions and Br- ions in the aqueous solution. Thus, HBr is increasing the H+ ion concentration in water by releasing H+ ions in it.

HBr → H+ + Br-

How HBr an Arrhenius acid?

When HBr get mixed in water it get breaks as H+ and Br- ions and thus the H+ ions get increases into water solution. So, the H3O+ (hydronium) ion gets formed in HBr and H2O reaction with the breakdown of Br- ion.

HBr + H2O → H3O+ + Br-

Is HBr polar or nonpolar?

Hydrogen bromide (HBr) is a polar molecule. HBr is polar molecule because the H and Br atoms have much difference in their electronegativity values.

Why HBr is polar?

The H atom has electronegativity value 2.20 and the Br atom has electronegativity value 2.96.Thus the electronegativity difference between H and Br atoms of HBr molecule is 0.7 which is greater value than 0.4 prescribed in Paulings rules. It states that any compound which has electronegativity difference between the atoms if more than 0.4 then it is a polar molecule.

Also the H atom is less electronegative than Br atom, thus the Br atom pulls the electron density towards itself. So, there is unequal sharing of electrons on H and Br atoms the net dipole moment arises in HBr molecule causing partial positive charge on H atom and partial negative charge on Br atom of HBr molecule.

How HBr is polar?

The HBr molecule has asymmetrical arrangement of atoms due to unequal or unsymmetrical distribution of electrons in HBr structure. So, the HBr molecule has linear molecular shape and tetrahedral electron geometry as it has unequal distribution of electrons in HBr. Hence, the HBr molecule is polar in nature.

Is HBr linear?

Yes, HBr is a linear molecule. As per the VSEPR theory the HBr lewis structure has AXE3 generic formula so it has linear structure.

Why HBr is linear?

According to VSEPR theory the HBr lewis structure has AXE3 generic formula and hence the molecular shape of HBr molecule is linear. Thus, HBr is linear in shape.

How HBr is linear?

In HBr lewis structure, it is a diatomic molecule containing only two atoms H and Br which are linked with each other with a single covalent bond in a straight line. The H atom shared its one electron with Br atom and form single covalent bond forming a straight line of the structure and hence HBr is a linear molecule.

Is HBr paramagnetic or diamagnetic?

Hydrogen bromide (HBr) is diamagnetic in nature, due to the presence of all paired electrons in the molecule.

Why HBr is diamagnetic?

Hydrogen bromide has total eight valence electrons, out of which it forms one single covalent bond within H and Br atoms by sharing their one – one valence electrons with each other. So, the HBr molecule has one bond pair electrons and three lone pair electrons on HBr molecule. Hence, all the electrons are paired in HBr thus it behaves as a diamagnetic molecule.

How HBr is diamagnetic?

The magnetic susceptibility values of diamagnetic molecules are negative always. Hence the HBr molecule has negative value of magnetic susceptibility. When the external magnetic field is applied on HBr solution it repels with the magnetic field and moves in opposite direction of magnetic field. Thus,  HBr is diamagnetic in nature.

HBr boiling point

Hydrogen bromide (HBr) molecule (gas or liquid) has 122 degree Celsius boiling point. Boiling point of liquid is the temperature at which the liquid substance boils and hopefully converts to vapours or gas. HBr has higher boiling point of 122 degree Celsius due to the larger size of HBr also it is more polarised molecule.

Why HBr has higher boiling point?

Hydrogen bromide gas when reacts with water it forms aqueous or liquid HBr solution i.e. hydrobromic acid. While forming liquid hydrobromic acid the HBr (hydrogen bromide) gas can form hydrogen bonds with water molecules.

Hence, there is the formation of strong intermolecular forces between H and Br atoms of HBr molecules i.e. hydrogen bonds and it is quite difficult to break these bonds.  Also it is more polar in nature and having greater degree of dispersion forces within the molecule, which operates the HBr molecule and hence HBr has higher boiling points.

HBr bond angle

As per the VSEPR theory, the HBr molecule has followed the AXE3 generic formula. According to which the HBr molecule has linear molecular shape and tetrahedral electron geometry. Also HBr has sp3 hybridization and hence the HBr molecule has 109.5 degree bond angle.

Is HBr diprotic?

No, HBr is not a diprotic molecule rather it is a mono – protic molecule. Di – protic is a molecule having two protons or two hydrogen atoms also known to be poly – protic. Mono – protic is a molecule having one proton or one hydrogen atom. In HBr molecule, there is only one proton or one hydrogen atom is present so it cannot be di – protic molecule rather it is being a mono – protic molecule.

Is HBr ionic or covalent?

Hydrogen bromide (HBr) is a covalent molecule in nature rather it behaves as polar covalent molecule.

Why HBr is covalent or polar covalent molecule?

The HBr molecule composed of H and Br atoms which have 2.2 and 2.9 electronegativity values. So, it has 0.7 electronegativity difference between H and Br molecule. As per the prescribed values of bonding within the molecules having particular electronegativity difference between its atoms, the molecule should be ionic, covalent and polar covalent in nature.

The ionic molecules are those which have electronegativity difference value of 2.0 within its atoms. The polar covalent molecules are those which have electronegativity difference value of 2.0 to 0.5 between its atoms. Covalent molecules are those which have electronegativity difference value of less than 0.5.

Hence, the HBr molecule has 0.7 electronegativity difference value between H and Br atoms, which comes under the prescribed value range of 2.0 to 0.5. Hence it has a polar covalent bonds. Thus, the HBr molecule is polar covalent in nature and not ionic molecule.

How HBr is covalent or polar covalent molecule?

The HBr (hydrogen bromide) molecule consists of hydrogen and bromine atoms. The hydrogen atom has one valence electron in its valence shell and the bromine atom has seven valence electrons in its valence shell. Both H and Br atoms thus share one – one electron with each other to form a single covalent bond.

This single covalent bond is quite strong bond which is not easily gets break. But the HBr molecule is being polar in nature.  The HBr molecule is being polar covalent bond due to the unequal sharing of electrons between H and Br atoms. Br atom is more electronegative than H atom and hence the electron cloud is pulls towards Br atom. Hence, HBr is polar covalent in nature.

Is HBr amphiprotic?

No, HBr (hydrobromic acid) is not an amphiprotic in nature. Amphiprotic or amphoteric compounds or molecules are those compounds which can behave both as an acid or base.

Why HBr is amphiprotic?

HBr (hydrobromic acid) cannot show both acidic and basic nature. When HBr acid reacts with base it can donate its proton and forms conjugate acid. But HBr (hydrobromic acid) cannot accept protons when reacts with base. HBr does not show any basic character so it is not amphiprotic in nature.

How HBr is amphiprotic?

As per the Bronstead and Lowery theory of acids and base, the acids are those compounds which can donate H+ ions or protons to base to form conjugate acid and the base are those compounds which can accepts H+ ions or protons to form conjugate base.

When hydrobromic acid (HBr) reacts with base like water (H2O) or ammonia (NH3) it will release or donate its proton to base (H2O or NH3) to form conjugate acids like H3O+ (hydronium) ions or NH4+ (ammonium) ions. But HBr (hydrobromic acid) cannot accept protons from other chemical compounds or basic compounds and hence it is not amphiprotic.

Is HBr binary or ternary?

HBr (hydrobromic acid) is a binary compound. Binary compounds are those compounds which have two non – metallic elements present in it. Especially the hydrogen atom (non – metal) gets combined or reacts with another non – metallic element.

Why HBr is binary?

HBr (hydrobrmoc acid) composed of two elements which are non – metallic in nature. That is the HBr molecule composed of one hydrogen atom and one bromine atom they both are non – metals and hence the HBr molecule is binary compound.

How HBr is binary?

Binary acids are those in which hydrogen atom is get connected with other non – metallic atom. Here, in HBr the hydrogen atom get attached with other non – metallic element like bromine. Bi means two, so two elements (non – metallic) are present in HBr and hence it is binary acid. HBr is a strong acid with pKa value of -9.0.

Is HBr balanced?

No, HBr is not a balanced equation basically, we have to balance the reaction by arranging same number of atoms on both reactant and product side. HBr aqueous or liquid i.e. acidic HBr (hydrobromic acid) it formed with the reaction of H2 (hydrogen) gas and Br2 (bromine) liquid. H2 which act as reducing agent and Br2 is act as oxidising agent.

H2 (g) + Br2 (aq) → HBr

The above reaction is not balanced as the atoms present on reactant side (H2 + Br2) is not equivalent with the product side (HBr), so we have to add 2 in front of HBr of product side to equalise the reaction equation.

H2 + Br2 → 2HBr

Hence the above HBr formation reaction is now balanced.

Is HBr conductive?

Yes, HBr is conductive in nature. HBr produces ions when mixed with water and conduct electricity and thus it is conductive in nature.

Why HBr is conductive?

HBr gas in pure form, it cannot conduct electricity. But when the hydrogen bromide gas (HBr) get bubbled in water (H2O) it forms a chemical reaction with water and form HBr liquid form i.e. hydrobromic acid.

This hydrobromic acid (HBr) on mixing with water release or donates H+ ions in water molecule and forms hydrogen bonding with water. Thus, HBr acid produces ions in water solution and conduct electricity.

How HBr is conductive?

HBr (hydrobromic acid) consists of two non – metallic elements like H and Br atoms. Hence, Hydrobromic acid (HBr) behaves as acid by donating H+ ions into water. It forms H+ and Br- ions in water solution i.e. it completely ionizes in water.

Also this H+ ions get attached with H2O (water) molecule to form H3O+ ions. These ions get moved towards the anode and cathode and conduct electricity in that solution. Hence, HBr behaves as strong acid and strong electrolyte and conduct electricity.

HBr + H2O → H3O+ + Br-

Is HBr conjugate base?

HBr (hydrobromic acid) can form conjugate base when reacts with a lewis base. Basically when HBr form acid base reaction it produces a conjugate base.

Why HBr is conjugate base?

Hydrobromic acid (HBr) donates or release a proton or H+ ions when reacts with base. Hence the base accepts the H+ ion or proton and form higher molecule with positive charge more protons and producing conjugate base as by – product.

How HBr is conjugate base?

HBr (hydrobromic acid) when reacts with lewis base like ammonia (NH3), the HBr acid donates H+ ion or proton to ammonia (NH3) molecule. Thus there is the formation of NH4+ (ammonium) ion and Br- ion as product of this acid – base reaction. Here, the Br- ion is formed in the reaction which acts as conjugate base.

HBr + NH3 → NH4+ + Br- (Br- = conjugate base)

Is HBr corrosive?

Yes, HBr is corrosive in nature. Hydrobromic acid on reaction with water produce H3O+ ion and when comes in contact with water and it forms corrosion.

Why HBr is corrosive?

HBr (hydrobromic acid) when reacts with water it gets ionizes completely and form H+ and Br- ions in water. HBr is a strong acid which forms more H+ ions in water or release more protons.

Hence due to the presence of more H+ ions in the solution, its pH value is less than 7 or less than 4. The pH value of hydrobromic acid is 3.01 and hence it is more corrosive in nature.

How HBr is corrosive?

When strong acidic compounds like HBr gets mixed with water it forms H+ and Br- ions in the solution and hence H+ ion concentration increases in water solution. Thus, the HBr acid can produce H3O+ ions in the solution. These H3O+ ions can reduce when comes in contact with metallic surface and form corrosion.

Also the acids corrosive nature can be measure capacity of acid to release H+ ions with the ‘acid dissociation constant’ pKa value. The HBr acid has -0.9 pKa value and hence more corrosive in nature. Therefore, HBr acid shows corrosive nature.

Is HBr concentrated?

Yes, hydrobromic acid (HBr) is a concentrated acid. Concentrated acids are those acids which are in pure forms or having its more concentration in water or produce more H+ ion concentration of water.

The HBr acid when mixed with water get completely dissociates into water as H+ and Br- ions. Hence there is the production of more H+ ions in water due to addition of HBr. Also it produces H3O+ ions so more concentration of H+ ion increases. Therefore, HBr is an concentrated acid.

Is HBr solid liquid or gas?

Yes, HBr is present in both a gas and a liquid. Pure form of HBr (hydrogen bromide) is present in gaseous form. It can produce only H+ and Br- ions when dissociates. But when this HBr gas gets bubbled into water.

There is the formation of aqueous hydrobromic acid (HBr aq). When this hydrobromic acid further reacts with water it forms hydrogen bonds with water and form H3O+ ions. Hence, HBr can show both gaseous and liquid nature.

Is HBr hygroscopic?

Yes, HBr is hygroscopic in nature. Hygroscopic substances are those substance or compounds which can absorb moisture from air or atmosphere and hence the physical properties (melting point, boiling point, etc) of that substance get changed. HBr can also absorb moisture from air and hence behaves as hygroscopic molecule.

Is HBr hydrogen bonding?

Yes HBr (hydrobromic acid) can form hydrogen bonding when mixed with water (H2O). When HBr acid get added to water it get dissociates into H+ and Br- ions, also it forms H3O+ (hydronium) ions in the solution as the H+ ion form hydrogen bond with H2O molecule.

HBr + H2O → H3O+ + Br-

Is HBr metal or non-metal?

HBr is non – metallic. HBr is composed of hydrogen (H) atom and bromine (Br) atom. Both H and Br atoms are comes under non – metals in the periodic table. Hence the hBr is non – metallic in nature.

Also the HBr in pure form is a gas (hydrogen bromide) and when it reacts with water it forms an aqueous or liquid HBr solution (hydrbromic acid). Therefore, HBr is non- metal in nature.

Is HBr neutral?

No, HBr is not neutral molecule. HBr is an acidic compound as it produces H+ ions when dissolved in water. It can form H+ and Br- ions in water solution.

Also the HBr molecule has polar covalent bond as the electron density goes to more electronegative bromine atom. Thus it creates partial positive charge on H atom and partial negative charge on Br atom. Therefore HBr is not neutral rather it is acidic in nature.

Is HBr a nucleophile?

No, HBr is not a nucleophile. Nucleophile is a substance which can donates its electrons i.e. it is electron rich. Nucleophiles are generally lewis base and a negative charge or neutral species. But HBr is an electrophile i.e. electron loving. It can accept electrons.

Why HBr is not a nucleophile?

HBr is an electrophile which can accepts electrons from other chemical compounds and donates its proton. Hence it is electron loving which accepts electrons from other atoms. Mostly electrophiles are lewis acids in nature and positively charged or neutral species.

How HBr is not a nucleophile?

HBr (hydrobromic acid) is generally a electrophile as it release or give up its hydrogen atom or proton or H+ ion to from new bond with other compounds by accepting electron from them. For Example: When ethene reacts with hydrogen bromide (HBr) it produces bromo ethane.

CH2=CH2 + HBr → CH3-CH2Br

Here, HBr behaves a s electrophile because it can accepts electron pair from ethane and donated its hydrogen atom or proton and creates a C-H bond with ethane molecule and the Br ion also attached with another carbon atom of ethane.

Is HBr organic or inorganic?

HBr (hydrogen bromide or hydrobromic acid) is an inorganic compound. Organic compounds are the compounds which contains carbon atom in its molecule or structure.

Mostly it contains hydrocarbon chain in its structure. In HBr molecule there is no carbon atom is present in its structure or chemical formula. Hence, HBr is an inorganic compound.

Is HBr oxidizing agent?

HBr is not an oxidizing agent rather is it a reducing agent or strong reducing agent. HBr (hydrogen bromide) has quite well dissociation energy due to which it can easily dissociates or ionizes completely into water when mixed with water.

HBr can ionize or dissociates into H+ and Br- ions when mixed with water. Hence, HBr is an reducing agent and not oxidizing agent.

Is HBr polyatomic?

Yes, HBr  (hydrobromic acid) or hydrogen bromide is an polyatomic molecule. HBr is composed of two elements i.e. hydrogen atom and bromine atom. So, there are two atoms are present in HBr molecule i.e. HBr is diatomic or polyatomic. Therefore, HBr is considered as polyatomic molecule.

Is HBr unstable?

The HBr is quite unstable compound. The stability of any compound is depends upon its electronegativity or charges present on atoms and its size.

The compound is more stable when it has small size or halogen atom and more electronegative in nature. Hence HBr is unstable in nature as it has the bromine atom which has small size and more electronegative than hydrogen atom.

Why HBr is unstable?

Stability of any compound is also depends on the loss or gains of electrons by the compound. When the compound gain or lose electrons being more stable by completing its octet. If the compound is more stable it can reacts less.

HBr is decomposed when dissolved in water but it cannot ionize easily or completely in water. Some of the HBr molecules are remains in water, so the HBr acid is unstable in nature. It can be stable under some recommended storage condition.

Is HBr volatile?

Yes, HBr is a volatile acid. Volatility can be predicted from the intermolecular forces within the molecule. As the molecular weight of the compound increases so the Vander walls forces also increases. It can vaporize easily into the atmosphere.

Why HBr is Volatile?

HBr (hydrobromic acid) is volatile in nature, due to the weak intermolecular forces or hydrogen bonding. It can ionize easily and vaporised or evaporate into the atmosphere at room temperature. Hence, HBr is a volatile acid.

Is HBr viscous?

Yes, HBr is quite viscous in nature as it can form hydrogen bonds. Viscosity is the measure of liquid resistant to move or flow. HBr cannot form hydrogen bonding with each other but it can form hydrogen bonds with water molecules.

As the HBr (hydrobromic acid) is fluid or liquid in nature. Thus due to intermolecular forces like hydrogen bonds with water hydrobromic acid is viscous in nature.

Conclusion:

HBr can be available in both gas and liquid forms. HBr lewis structure has total eight valence electrons. Out for which one is bond pair and three is lone pair electron. There is no resonance structure of HBr. Also no formal charge is present on HBr lewis structure. Br atom of HBr has complete octet. The HBr has linear shape and tetrahedral geometry with sp3 hybridization and 109.5 degree bond angle.

Dr. Shruti Ramteke

Hello everyone I am Dr. Shruti M Ramteke, i did my Ph.D in chemistry. I have five years of teaching experience for 11-12 standard, B,Sc and MSc in chemistry subject. I have published total five research articles during Ph.D on my research work and i have fellowship from UGC for my Ph.D. My Masters with specilization Inorganic chemistry and my graduation with chemistry, zoology and environmental science subjects. thank You

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