Cu(NO3)2+2NaOH--> Cu(OH)2+2NaNO3

Before

During



After

In this reaction we started with the Cu(NO3)2 and added NaOH. Then took the new solution and put it over a hot plate stirring constantly until the solution changed to a black color. The color change signified that the solution had changed to Cu(OH)2 and NaNO3, which burned off with the heat. The ending copper is the black solid as the bottom of the beaker.