GCSE / O Levels Chemistry

In which reaction are two of the products salts?
A aqueous lead(II) nitrate and aqueous copper(II) sulfate
B aqueous sodium hydroxide and solid ammonium sulfate
c dilute hydrochloric acid and aqueous sodium carbonate
D dilute hydrochloric acid and magnesium


Choice A is correct because: 

The reaction between aqueous lead(II) nitrate (Pb(NO₃)₂) and aqueous copper(II) sulfate (CuSO₄) results in a double displacement reaction where lead(II) sulfate (PbSO₄) and copper(II) nitrate (Cu(NO₃)₂) are formed. Both of these products are salts. 

The reaction is as follows: Pb(NO₃)₂(aq) + CuSO₄(aq) -> PbSO₄(s) + Cu(NO₃)₂(aq)

Choice B is incorrect because:

The reaction between aqueous sodium hydroxide (NaOH) and solid ammonium sulfate ((NH₄)₂SO₄) produces a salt (sodium sulfate, Na₂SO₄), water (H₂O), and ammonia (NH₃), not two salts. 

The reaction is as follows: 2NaOH(aq) + (NH₄)₂SO₄(s) -> Na₂SO₄(aq) + 2NH₃(g) + 2H₂O(l)

Choice C is incorrect because: 

The reaction between dilute hydrochloric acid (HCl) and aqueous sodium carbonate (Na₂CO₃) produces a salt (sodium chloride, NaCl), water (H₂O), and carbon dioxide (CO₂), not two salts. 

The reaction is as follows: 2HCl(aq) + Na₂CO₃(aq) -> 2NaCl(aq) + H₂O(l) + CO₂(g)

Choice D is incorrect because: 

The reaction between dilute hydrochloric acid (HCl) and magnesium (Mg) produces a salt (magnesium chloride, MgCl₂) and hydrogen gas (H₂), not two salts. 

The reaction is as follows: 2HCl(aq) + Mg(s) -> MgCl₂(aq) + H₂(g)

Preparation of Salts | 2016 - M/J - 5070/12 | Q21