Describe reactions of copper with nitric acid.

Reactions of copper with nitric  acid

(a) Copper does not react with very dilute nitric acid

(b) With 50% nitric acid it forms copper nitrate, nitrogen monoxide and water.

3Cu (s) + 8HNO₃ (l) → 3Cu(NO₃)₂ (aq)   + 4H₂O (l) + 2NO (g)

(c) Copper reacts with concentrated nitric acid to form copper nitrate, nitrogen dioxide and water

Cu (s) + 4HNO₃ (l) → Cu(NO₃)₂ (aq)   + 2H₂O (l) + 2NO₂ (g)

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