Question
Explain the reaction of metals with nitric acid.
✓
Answer
For examples:
Copper reacts with nitric acid in the following manner
$3 Cu+6 HNO_3 \rightarrow 3 Cu\left(NO_3\right)_2+6(H)$
$6(H)+3 HNO_3 \rightarrow 3 HNO_2+3 H_2 O$
$3 HNO_2 \rightarrow HNO_3+2 NO^2+H_2 O$
Overall reaction
$3 Cu+8 HNO_3 \rightarrow 3 CU\left(NO_3\right)_2+2 NO+4 H_2 O$
The concentrated acid has a tendency to form nitrogen dioxide
$Cu+4 HNO_3 \rightarrow 3 CU\left(NO_3\right)_2+2 NO_2+2 H_2 O$
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