Question

Give balanced chemical equations for the preparation of the following salts:
1. Lead sulphate — from lead carbonate.
2. Sodium sulphate — using dilute sulphuric acid.
3. Copper chloride — using copper carbonate.

  • Acids Bases and Salts
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Answer

  1. Lead sulphate from lead carbonate.
    PbCO3 + 2HNO3 ⟶ Pb(NO3)2 + H2O + CO2
    Pb(NO3)2 + Na2SO4 ⟶ 2NaNO3 + PbSO4
  2. Sodium sulphate using dilute sulphuric acid.
    Na2CO3 + H2SO4(dil.) ⟶ Na2SO4 + H2O+ CO2
  3. Copper chloride using copper carbonate.
    CuCO3 + 2HCl (dil) ⟶ CuCl2 + H2O + CO2

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Acids Bases and Salts

The diagram represents the preparation of sodium sulphate salt from dil. H2SO4 acid and sodium hydroxide.

1. Name the apparatus ‘A’.

2. Name the substance ‘X’ placed in ‘A’ and the substance ‘Y’ placed in B.

3. State the reason for conducting the titration using the apparatus ‘A’ and ‘B’.

4. State which solution is transferred to the evaporating dish and evaporated to point of crystallization for obtaining the salt.

5. State why titration is not conducted for the preparation of copper [II] sulphate crystals by neutralization.

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