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.

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:

$\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}

$\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}