<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> Copper (II) nitrate, Cu (N O), is an inorganic compound that forms a blue crystalline solid . Anhydrous copper nitrate forms deep blue - green crystals and sublimes in a vacuum at 150 - 200 ° C. Copper nitrate also occurs as five different hydrates, the most common ones being the trihydrate and hexahydrate . These materials are more commonly encountered in commerce than in the laboratory . </P> <P> Hydrated copper nitrate can be prepared by hydration of the anhydrous material or by treating copper metal with an aqueous solution of silver nitrate or concentrated nitric acid: </P>

What is the chemical formula for copper(ii) nitrate pentahydrate