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ICSE Class 9 Chemistry Question 6 of 18

Chemical Changes & Reactions — Question 14

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Question

Question 14

Explain the term double decomposition precipitation reaction. Give a balanced equation for the preparation of two different insoluble lead salts from their salt solutions by double decomposition precipitation.

Answer

Reaction between two compounds in aqueous solution state to give two new compounds one of which is insoluble is called double decomposition precipitation reaction.

Balanced equations for the preparation of two different insoluble lead salts are given below:

Pb(NO3)2Lead nitrate+2NaClsodium chloride⟶2NaNO3sodium nitrate+PbCl2↓Lead [II] chloride\underset{\text{Lead nitrate}}{\text{Pb(NO}_3)_2} + \underset{\text{sodium chloride}}{2\text{NaCl}} \longrightarrow \underset{\text{sodium nitrate}}{2{\text{NaNO}_3}} + \underset{\text{Lead [II] chloride}}{\text{PbCl}_2 \downarrow}

Pb(NO3)2Lead nitrate+Na2SO4sodium sulphate⟶2NaNO3sodium nitrate+PbSO4↓Lead sulphate\underset{\text{Lead nitrate}}{\text{Pb(NO}_3)_2} + \underset{\text{sodium sulphate}}{\text{Na}_2\text{SO}_4} \longrightarrow \underset{\text{sodium nitrate}}{2{\text{NaNO}_3}} + \underset{\text{Lead sulphate}}{\text{PbSO}_4 \downarrow}