Question

How are the following salts prepared? 

1) Calcium sulphate from calcium carbonate

2) Lead carbonate from lead nitrate

3) Sodium nitrate from sodium hydroxide

4) Magnesium carbonate from magnesium chloride

Answer 1

1) When calcium carbonate is treated with sulphuric acid it forms calcium sulphate. 

CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂

2) When lead nitrate is treated with carbonic acid we will get lead carbonate.

Pb(NO₃)₂ + H₂CO₃ → PbCO₃ + 2 HNO₃

3)  When sodium hydroxide is reacted with nitric acid it will form sodium nitrate. 

NaOH + HNO₃ → NaNO₃ + H₂O

4) When magnesium carbonate is reacted with hydrochloric acid it forms magnesium chloride.

MgCO₃ + 2 HCl → MgCl₂ + H₂O + CO₂