Question

In the preparation of an insoluble salt from another insoluble salt by precipitation [double decomposition], dilute nitric acid and not dilute sulphuric acid is generally used.Give reason.

Answer 1

Direct addition of dil. H₂SO₄ to PbCO₃ is an impractical method of preparing lead sulphate since PbSO₄ is insoluble and forms a coating on PbCO₃ , thereby the reaction slowly comes to a stop.