Chemistry

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.

Hydrogen Chloride

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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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