Question

State your observations when dilute hydrochloric acid is added to :
(i) Lead nitrate soln. and the mixture is heated.
(ii) Copper carbonate.
(iii) Sodium thiosulphate.

August 22, 2024

Answer

(i) White precipitate of PbCl₂ is formed which is soluble in hot water.

Pb(NO₃)₂ + 2HCl ⟶ PbCl₂ ↓ + 2HNO₃

(ii) Effervescence of CO₂ seen which turns lime water milky

CuCO₃ + 2HCl ⟶ CuCl₂ + H₂O + CO₂

(iii) Yellow particles of S precipitate.

Na₂S₂O₃ + 2HCl ⟶ 2NaCl + SO₂ + S + H₂O

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