Question

Write equations to show the reaction between the following:
(i) copper and concentrated nitric acid
(ii) copper oxide and dilute nitric acid

Answer 1

(i) $\mathrm{Cu}+4{\mathrm{HNO}}_3\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2+2{\mathrm{H}}_2\mathrm{O}+2{\mathrm{NO}}_2$
(ii) $\mathrm{CuO}+2{\mathrm{HNO}}_3\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2+{\mathrm{H}}_2\mathrm{O}$