Question

Convert (i) NaHCO3 (ii) Na2CO3 to unstable carbonic acid by action with dil. H2SO4. State the reason why ammonia is evolved when an ammonium salt and alkali are heated.

July 30, 2024

Answer

2NaHCO₃ + H₂SO₄ [dil.] ⟶ Na₂SO₄ + 2H₂O + 2CO₂ ⟶ H₂CO₃ (unstable)

Na₂CO₃ + H₂SO₄ [dil.] ⟶ Na₂SO₄ + H₂O + CO₂ ⟶ H₂CO₃ (unstable)

Ammonia is evolved when an ammonium salt and alkali are heated because a less volatile base (e.g.,NaOH) displace the more volatile base, NH₄OH and we get the products NH₃ and H₂O.

NH₄Cl + NaOH ⟶ NaCl + H₂O + NH₃

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Question

Convert (i) NaHCO3 (ii) Na2CO3 to unstable carbonic acid by action with dil. H2SO4. State the reason why ammonia is evolved when an ammonium salt and alkali are heated.

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