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This synthesis reaction produces Copper(II) nitrate(bluish-green), Water and Nitrogen Dioxide(reddish-yellow). Nitrogen dioxide is produced only if the acid is concentrated.

Copper + (Conc.)Nitric acid ----> Copper(II) nitrate + Water + Nitrogen dioxide

Cu + 2HNO3 ----> Cu(NO3)2 + H2O + NO2

NOTE: If the gas coming out is colourless, it is not Nitrogen dioxide, i.e. it is Nitrogen monoxide. This also means that your acid is not concentrated. Nitrogen monoxide is only produced when the acid is dilute. This is the equation:

Copper + (Dil.)Nitric acid ----> Copper(II) nitrate + Water + Nitrogen monoxide

Cu + HNO3 ----> Cu(NO3)2 + H2O + NO

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