Question

The colour of copper sulphate Crystals changes when heated.why?

Answer 1

A clean copper surface will appear, well, copper colored. As it is heated, a layer of black copper oxide will form, thus changing its color. ... Then the layer begins to decompose as the copper gives up the oxygen faster than it reacts. Then as the temperature gets even hotter, the metal begins to glow from sheer heat.
plz mark me as brainliest

Answer 2

Copper sulphate is a hydrated salt which contains 5 molecules of water of crystallization. The blue colour of the copper sulphate is due to the presence of these water molecules. When it is heated, the water molecules are lost and copper sulphate pentahydrate becomes anhydrous copper sulphate. So, its colour changes from blue to grey-white.