Question

Give a balanced chemical equation. Action of heat on a mixture of copper and concentrated nitric acid.

Answer 1

1. Metals react with nitric acid to form metal nitrate along with various oxides of nitrogen $(\mathrm{NO},{\mathrm{NO}}_2)$ .
2. When copper reacts with concentrated nitric acid, nitrogen dioxide gas is liberated.

Therefore, the balanced chemical equation for this reaction can be written as: $\mathrm{Cu}\left(\mathrm{s}\right)+4{\mathrm{HNO}}_3\left(\mathrm{aq}\right)\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)+2{\mathrm{NO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$.