21 Facts on HBr+PbCrO4 : What, How to balance & FAQ

The purpose of chemical reaction is to be able to recognize chemical products. Let us see which type of reaction occurs in such a case.

Lead(2)Chromate is a strong oxidizing agent in which Pb exists in +2 oxidation state. It is less soluble in water but soluble in ammonia. It is a stable compound.While HBr is  colorless gas and used as a catalyst, it is a strong acid.

Now in this article we are going to learn about such properties like intermolecular forces, reaction enthalpy, buffer solution and so on.

What is the product of HBr + PbCrO4 ?

HBr and PbCrO4 when reacted form lead(2) bromide and chromium oxide and water.

  • PbCrO4 + 2HBr -> PbBr2 + CrO3 + H2O

What type of reaction is HBr + PbCrO4 ?

It is an acid base reaction or neutralization reaction.  In this reaction acidic salt, acidic oxide and water are formed. 

How to balance HBr and PbCrO4 ?

HBr + PbCrO4 reaction is balanced in the following steps-

  • HBr + PbCrO4 -> PbBr2 + CrO3 + H2O
  • In This following reaction both reactant and product must be present in equal amounts, stoichiometry of this reaction, 2 molecules of HBr multiply with H2 and Br. 

2 HBr + PbCrO4 -> PbBr2 + CrO3 + H2O

HBr + PbCrO4 Titration ?

PbBrO4 compound is giving Acid-Base titration. There are following steps for this titration.

Apparatus

  • Conical flask 
  • Burette
  • Volumetric flask
  • Beaker
  • Pippate 

Titrate and titrant

  • HBr is used as a titrant because its concentration is known.
  • PbCrO4 concentration is unknown in the sample so it is used as titre.

Indicator

In this acid base titration we know the PbCrO4 is an orange-yellow color compound. So, Methyl orange is used as an indicator because it changes the color of the acid.

Procedure

  • Firstly weigh the sample of Lead Chromate and dissolve in cold water because it is less soluble in cold water and mix it well in conical flask.
  • Now this sample is added into the burette.
  • The titrant is taken into the pipette and poured into the conical flask.
  • And drop wise the unknown sample is added to this conical flask and where reaction occurs.
  • The indicator methyl orange is added to the conical flask where the color is changed and it becomes yellow to orange.
  • And the endpoint occurs when the yellow color turns into orange .
  • The above procedure is repeated 3 times for consistent readings.
  • The concentration of solution is calculated by M1V1 = M2V2.

HBr + PbCrO4 net ionic equation

The net ionic equation between HBr + PbCrO4 is-

Pb+2 (s) + CrO4-2 (s) + 2HBr-1 (g)   →  Pb+2 (s) + Br-1 + CrO3+6(s) + H2O+1 (aq)

  • HBr is dissolved into the Bromine and Hydrogen ions.
  • PbCrO4 is dissolved into the Lead Ions and Chromium trioxide.
  • And one molecule of water is also formed.

HBr and PbCrO4 Conjugated pairs

HBr + PbCrO4 there is only one conjugated pair available.

  • The conjugate acid of H2CrO4  = HCrO4

HBr + PbCrO4 Intermolecular forces

HBr And PbCrO4 reaction has following intermolecular forces

  • HBr is containing  dipole – dipole force because hydrogen and bromine have differences in interaction. It also consists of hydrogen bonding and London dispersion forces.
  • PbCrO4 have strong ionic forces due to presence of CrO4 and also have dipole dipole interaction.

HBr + PbCrO4 reaction enthalpy

The standard enthalpy for the HBr +PbCrO4 is around -150.3 kJ/mol. Brief enthalpy information is as follows-

  • Lead(2)chromate =150.3 KJ/mol
  • Hydrogen bromide = -75.13KJ/mol
  • Lead(3) bromide = 150.3KJ/mol
  • Chromium oxide = -150.3 Kj/mol
  • Water= -150.3 KJ/mol

Is HBr + PbCrO4 a buffer solution?

HBr+PbCrO4 is a buffer solution because the nature of PbCrO4 acts as a weak acid while PbBr2 acts as a conjugate base that’s why it is a buffer solution. So, It maintain the pH of the solution.

Is HBr + PbCrO4 a complete reaction ?

HBr + PbCrO4 is a complete reaction because the product is completely formed and the water is released from it.

Is HBr + PbCrO4 an exothermic reaction ?

HBr and PbCrO4 is an exothermic in nature and the overall enthalpy is negative . Because it is a stable compound when they react together, a lot of heat is released due to bond breaking.

Is HBr + PbCrO4 a Redox Reaction ? 

HBr + PbCrO4 is not a redox type reaction because the oxidation state of both side  reactant and product are similar and the atoms do not change their state.

Is HBr + PbCrO4 a Precipitation Reaction ?

HBr + PbCrO4 reaction gives precipitation reaction because the product  exists in solid state in white color powdered form that is precipitate for this reaction ,which is insoluble in water.

Is HBr + PbCrO4 a Reversible Reaction ?

HBr + PbCrO4 reaction gives reversible reaction because it is an acid base reaction. These types of reactions can convert reactants to products. 

Is HBr and PbCrO4 a Displacement reaction ?

HBr + PbCrO4 reaction is a  double displacement reaction because the ions present in reaction are completely replaced to the product side.

  • The hydrogen ions are combined with acid and form water molecules.
  • The Bromine ion is combined with Pb+2 ion and forms an acidic salt.

Conclusion

PbCrO4 is an inorganic compound. It is hazardous in nature .It is less soluble in water but soluble in ammonia.It is a yellow color compound that is used in pigmentation. It has carcinogenic properties.It used in industries for coloring agents like paints, dye, ink.