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(15%) This question involves several reactions of copper and its compounds.
A sample of copper metal is dissolved in 6 M nitric acid contained in a round bottom flask. This reaction yields a blue
solution and emits a colorless gas which is found to be nitric oxide. Write a balanced equation for this reaction.
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In order to solve for this, first we have to do the word equation for the reaction.
`Copper + 6 M Nitric acid -> unknown blue-colo red solution + Nitric O x ide gas`
Solution of Copper (II) nitrate produces blue-colored solution:
`Cu + HNO3 -> Cu(NO_(3))_2 + NO`
This reaction also produces water, therefore:
`Cu + HNO3 -> Cu(NO_(3))_2 + NO + H_2O`
Finally, balance the equation: (final answer)
`3 Cu + 8 HNO3 -> 3 Cu(NO_(3))_2 + 2 NO + 4 H_2O`
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