Question

A zinc plate was put into a solution of copper sulphate kept in a glass container. it was found that the blue colour of the solution gets fader and fader with time . After few days when zinc plate was taken out , number of holes were observed. a) State the reasons for change observed in zinc plate. b) Write the chemical equation.

Answer 1

b)Zn+ CuSO4 -> ZnSO4 + Cu
a) The blue color in the solution in the glass container is fading because eventhough the color of CuSO4 is Blue when the reaction taking place, the amount of CuSO4 reduces and ZnSO4 increases. as the color of ZnSO4 is colorless, it indicates that the amount of ZnSO4 is increasing Gradually

Answer 2

Zinc metal is more reactive than copper. Some of the Zinc metal of zinc plate dissolves and displaces copper from copper sulphate solution. This dissolving of zinc metal forms tiny holes in zinc plate.Blue colour of copper sulphate solution gas lighter lighter due to the formation of colourless zinc sulphate solution