Question

By writing chemical equation

Give two examples of chemical double decomposition.

Answer 1

A double decomposition reaction is a type of decomposition reaction in which two constituent reactants interchange positive and negative ions and form two new compounds.

Barium Chloride reacts with Sodium sulphate to form Barium Sulphate and Sodium Chloride

$$\begin{gathered} {\mathrm{BaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to {\mathrm{BaSO}}_4\left(\mathrm{s}\right)+2\mathrm{NaCl}\left(\mathrm{aq}\right) \\ {\mathrm{Ba}}^{2+}+2{\mathrm{Cl}}^{-}+2{\mathrm{Na}}^{+}+{\mathrm{SO}}_4^{2-}\to {\mathrm{Ba}}^{2+}+{\mathrm{SO}}_4^{2-}+2{\mathrm{Na}}^{+}+2{\mathrm{Cl}}^{-} \end{gathered}$$

Silver nitrate and Sodium chloride react and form white precipitate that is silver chloride and sodium nitrate which is colourless compound.

${\mathrm{AgNO}}_3\left(\mathrm{aq}\right)+\mathrm{NaCl}\left(\mathrm{aq}\right)\to \mathrm{AgCl}+{\mathrm{NaNO}}_3$