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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