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Calcium nitrate and copper sulfate are recommended!

You could use copper oxide and nitric acid but it is very unfavourable as a reaction!

Cu + 4HNO3 ------> Cu(NO3)2 + 2H2O + 2NO2 

when we put copper rod into conc. Nitric Acid a blue colour liquid substance will form that is Copper Nitrate and a reddish-brown Gas will extracted out that is Nitrogen Dioxide and water will also occur 

Hi at8745, 

The formula for copper nitrate is: Cu(NO3)2

Copper nitrate is formed from Nitric Acid (HNO3) and Copper (Cu) in this reaction:

Cu + 4HNO3 --> Cu(NO3)2 + 2H20 + 2NO2

Hope this helps :)

If u need any help don't hesitate to contact me :)

Have a nice day!

It is much eas­i­er to dis­solve metal­lic cop­per ox­ide and cop­per hy­drox­ide in a con­cen­trat­ed so­lu­tion of ni­tric acid HNO3. The equa­tions of these re­ac­tions look as fol­lows:

Cu + 4HNO3 = Cu(NO3)2 + 2NO2 + 2H2O

CuO + 2HNO3 = Cu(NO3)2 + 2H2O

Cu(OH)2 + 2HNO3 = Cu(NO3)2 + 2H2O

An­hy­drous cop­per ni­trate Cu(NO3)2can be ob­tained by car­ry­ing out a re­ac­tion of met­al cop­per with tetraox­ide ni­trate (con­di­tions for car­ry­ing out the re­ac­tion – at a tem­per­a­ture of 80 °C and in ethyl ac­etate):

Cu + N2O4= Cu(NO3)2 + 2NO

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