When tetraoxosulphate(VI) acid reacts with sodium chloride, a gas is evolved which gives dense white

JAMB Chemistry 2023 69 views

When tetraoxosulphate(VI) acid reacts with sodium chloride, a gas is evolved which gives dense white fumes with ammonia. Which gas is evolved?

  1. HCl ✓
  2. NH₄Cl
  3. NH₄OH
  4. (NH₄)₂SO₄

Explanation

Sulfuric acid reacts with sodium chloride to produce hydrogen chloride gas. When HCl gas meets ammonia gas, they react instantly to form ammonium chloride as dense white fumes.

The reaction is: HCl + NH₃ → NH₄Cl. The white fumes are tiny particles of solid ammonium chloride suspended in air.

This white fume test confirms the presence of HCl gas. The instant formation of white smoke when ammonia approaches is a characteristic test for hydrogen chloride.

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