15 Facts on H2SO4 + Fe(OH)3: What, How To Balance & FAQs

The reaction between H2SO4 and Fe(OH)3 follows an inorganic mechanism where the latter is a weak base rather electrolyte. Let us see the reaction of H2SO4 and Fe(OH)3 in deatil.

Ferric hydroxide is the weak base where iron is present at the +3 oxidation state. So, it can react with a strong acid like sulfuric acid and form corresponding salt and water. There is also a hydrated part present in the ferric oxide so when it reacts with sulfuric acid, the acid absorbs the water.

By the reaction between Fe(OH)3 and H2SO4, we can estimate the quantity of iron in the respective sample. Let us discuss the mechanism of the reaction between sulfuric acid and iron, the reaction enthalpy, the type of reaction, product formation, etc. in the following part of the article.

1. What is the product of H2SO4 and Fe(OH)3?

Ferric sulfate is a major product formed when H2SO4 and Fe(OH)3 are reacted together along with water molecules. Fe is present in a higher position than hydrogen in the electrochemical series so the corresponding sulfate is formed.

Product of the reaction between
H2SO4 and Fe(OH)3

2. What type of reaction is H2SO4 + Fe(OH)3?

H2SO4 + Fe(OH)3 reaction is an example of a neutralization reaction and single displacement reaction along with redox and precipitation reactions. Here, acid compounds neutralize alkali compounds feebly and forms salt and water.

3. How to balance H2SO4 + Fe(OH)3?

H2SO4 + Fe(OH)3 = Fe2(SO4)3 + H2O this reaction is not balanced yet, we have to balance the equation in the following way-

  • First, we label all the reactants and products by A, B, C, and D as there are only four molecules obtained for this reaction and the reaction looks like: A H2SO4 + B Fe(OH)3  = C Fe2(SO4)3 + D H2O
  • Equating the coefficients for the same type of elements by rearranging them.
  • After the rearrangement of coefficients of the same elements by their stoichiometric proportion, we get, H = 2A = 2D, S = A = 3C, O = 4A = 3C = 12C = 2D, Fe = B = 2C.
  • Using the Gaussian elimination and equating all the equations we get, A = 3, B = 2, C = 1, and D = 6, so the oxidation number of Fe is +2 on both sides.
  •  The overall balanced equation will be,

3H2SO4 + 2Fe(OH)3 = Fe2(SO4)3 + 6H2O

4. H2SO4 + Fe(OH)3 titration

To estimate the quantity of sulfur or copper we can perform a titration between Fe(OH)3 and H2SO4.

Apparatus used

We need a burette, conical flask, burette holder, volumetric flask, and beakers for this titration.

Titre and titrant

H2SO4 versus Fe(OH)3, H2SO4 acts as a titrant which is taken in the burette and the molecule to be analyzed is Fe which is taken in a conical flask.

Indicator

The whole titration is done in an acidic medium or acidic pH so the best suitable indicator will be phenolphthalein which gives perfect results for this titration at given pH.

Procedure

The burette is filled with standardized H2SO4. Fe is taken in a conical flask along with respective indicators. H2SO4 is added dropwise to the conical flask and the flask is shaken constantly. After a certain time, when the endpoint arrives, indicator changes its color and the reaction is done.

We repeat the titration several times for better results and then we estimate the iron as well as sulfate quantity by the formula V1S= V2S2.

5. H2SO4+ Fe(OH)3 net ionic equation

The net ionic equation between H2SO4 + Fe(OH)3 is as follows,

2H+ + SO42- + Fe3+ + 3OH = 2Fe3+ + 3SO42- + H+ + OH

To derive the net ionic equation, the following steps are required,

  • H2SO4 will be ionized in proton and sulfate ions as it is a strong electrolyte
  • After that Fe(OH)3 also dissociates into ferric ions and hydroxide ions as it is also a weak electrolyte
  • And lastly, water is ionized into H+ and OH by dissociation.

6. H2SO4+ Fe(OH)3 conjugate pairs

In the reaction, H2SO4 + Fe(OH)3 conjugate pairs will be the corresponding de-protonated and protonated form of that particular species which are listed below-

  • Conjugate pair of H2SO4 = SO42-
  • Conjugate pair of OH = H2O

7. H2SO4 and Fe(OH)3 intermolecular forces

The intermolecular force present in H2SO4 is the strong electrostatic force between protons and sulfate ions. Also due to polarity, some Van der Waal’s force of attraction is present but in the case of H2, covalent force, as well as dipole interaction is present, and for FeSO4 only covalent force is present.

MoleculeActing
force
H2SO4Electrostatic,
van der waal’s
Dipole
interaction
Fe(OH)3Strong electrostatic
force and
ionic interaction
Fe2(SO4)3Columbia force,
ionic interaction,
metallic bond
H2OCovalent,
H-bonding
Intermolecular Forces

8. H2SO4 + Fe(OH)3 reaction enthalpy

H2SO4 + Fe reaction enthalpy is -1353 KJ/mol which can be obtained by the formula: enthalpy of products – enthalpy of reactants. Here the change in enthalpy is positive.

MoleculeEnthalpy
(KJ/mol)
Fe(OH)3-824
H2SO4-814
Fe2(SO4)3-2583
H2O-68
Enthalpy of Reactants
and Products

9. Is H2SO4 + Fe(OH)3 a buffer solution?

The reaction between H2SO4 + Fe(OH)3 gives a buffer solution of Fe2(SO4)3 and H2O and they can control the pH of the reaction.

10. Is H2SO4 + Fe(OH)3 a complete reaction?

The reaction between H2SO4 + Fe is a complete reaction because it gives one complete product Fe2(SO4)3 along with H2O.

11. Is H2SO4 + Fe(OH)3  an exothermic or endothermic reaction?

The reaction of H2SO4 + Fe(OH)3 is exothermic in terms of thermodynamics first law. This reaction releases more energy and temperature to the surroundings which helps to complete the reaction, Where δH is always negative.

12. Is H2SO4 + Fe(OH)3  a redox reaction?

H2SO4 + Fe(OH)3 reaction is a redox reaction because in this reaction many elements get reduced and oxidized as iron gets reduced and sulfur gets oxidized.

Redox Schematic of the
H2SO4 and Fe Reaction

13. Is H2SO4 + Fe(OH)3  a precipitation reaction

The reaction H2SO4 + Fe(OH)3 is a precipitation reaction because Fe2(SO4)3  gets precipitated in the solution and is not soluble in the reaction mixture.

14. Is H2SO4 + Fe(OH)3 reversible or irreversible reaction?

The reaction between H2SO4+ Fe(OH)3 is reversible because it is one kind of acid-base reaction. Where the produced salt can react with water and can proceed with the reaction in the backward direction. Where the equilibrium is shifted in the forward direction.

Reversible Reaction Direction

15. Is H2SO4 + Fe(OH)3  displacement reaction?

The reaction between H2SO4+ Fe(OH)3 is an example of double displacement reaction because in the above reaction Fe3+ displaced H+ in H2SO4 and H+ displaced Fe3+ in Fe(OH)3.

Double Displacement Reaction

Conclusion

The reaction between H2SO4 and Fe(OH)3 gives us a electrolytic salt ferric sulfate where we can estimate the amount of iron present. This reaction is acid-base and reversible reaction, so it can again formed the acid and base which is economically friendly.

Read more facts on H2SO4:

H2SO4 + KClO3
H2SO4 + NaH
H2SO4 + NaOCl
H2SO4 + K2S
H2SO4 + MnO2
H2SO4 + HCOOH
H2SO4 + Mn2O7
H2SO4 + Mg
H2SO4 + Na2CO3
H2SO4 + MnS
H2SO4 + NaHSO3
H2SO4 + CaCO3
H2SO4 + CH3COONa
H2SO4 + Sn
H2SO4 + Al2O3
H2SO4 + SO3
H2SO4 + H2O
H2SO4 + Fe2S3
H2SO4 + NH4OH
H2SO4 + Li3PO4
H2SO4 + Na2HPO4
H2SO4 + Zn(OH)2
H2SO4 + BeO
H2SO4 + KOH
H2SO4 + CH3CH2OH
H2SO4 + Li2O
H2SO4 + K2Cr2O7
H2SO4 + NaOH
H2SO4+ Ag
H2SO4 + Mn3O4
H2SO4 + NaH2PO4
H2SO4 + Sr
H2SO4-HG2(NO3)2
H2SO4 + Pb(NO3)2
H2SO4 + Na
H2SO4 + Ag2S
H2SO4 + BaCO3
H2SO4 + PbCO3
H2SO4 + Sr(OH)2
H2SO4 +Mg3N2
H2SO4 + LiOH
H2SO4 + Cl2
H2SO4 + Be
H2SO4 + Na2S
H2SO4 + Na2S2O3
H2SO4 + As2S3
H2SO4 + Fe(OH)3
H2SO4 + Al(OH)3
H2SO4 + NaI
H2SO4 + K2CO3
H2SO4 + NaNO3
H2SO4 + CuO
H2SO4 + Fe2O3
H2SO4 + AgNO3
H2SO4 + K2SO4
H2SO4-HGO
H2SO4 + Ba
H2SO4 + MnCO3
H2SO4 + K2SO3
H2SO4 + PbCl2
H2SO4 + P4O10
H2SO4 + NaHCO3
H2SO4 + O3
H2SO4 + Ca(OH)2
H2SO4 + Be(OH)2
HCl + H2SO4
H2SO4 + FeCl2
H2SO4 + ZnCl2
H2SO4 + Al2(SO3)3
H2SO4 + KMnO4
H2SO4 + CH3NH2
H2SO4 + CH3COOH
H2SO4 + Pb
H2SO4 + CH3OH
H2SO4 + Fe2(CO3)3
H2SO4 + Li2CO3
H2SO4 + MgO
H2SO4 + F2
H2SO4 + Zn(NO3)2
H2SO4 + Ca
H2SO4 + K2O
H2SO4 + Mg(OH)2
H2SO4+NaF
H2SO4 + Sb2S3
H2SO4 + NH4NO3
H2SO4 + AlBr3
H2SO4 + CsOH
H2SO4 + BaSO3
H2SO4 + AlCl3
H2SO4 + AlPO4
H2SO4 + Li2SO3
H2SO4 + Fe
H2SO4 + HCOONa
H2SO4 + Cu
H2SO4 + PbS
H2SO4 + P2O5
H2SO4 + CuCO3
H2SO4 + Li
H2SO4 + K2CrO4
H2SO4 + Ag2O
H2SO4 +Mg2Si
H2SO4 + Mn(OH)2
H2SO4+ NACLO2
H2SO4 + K
H2SO4 + CaCl2
H2SO4 + Li2S
H2SO4 + SrCO3
H2SO4 + H2O2
H2SO4 + CuS
H2SO4 + KBr
H2SO4 + Fe3O4
H2SO4 + Fe3O4
H2SO4 + KI
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