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Question
State what happens when concentrated HNO3 is added to:
Copper turnings
Very Short Answer
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Solution
A vigorous reaction occurs, forming a blue solution of copper nitrate, and dense reddish-brown \(\text{NO}_{2}\) gas is evolved.
\[\ce{Cu + 4HNO3 -> Cu(NO3)2 + 2H2O + 2NO2 ^}\]
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