Question

A blue colour vitriol on heating turns white in colour . water droplets are seen on the inner sides of the test tube. identify the blue vitriol and white compound formed state the reason for the observations

Answer 1

We know that blue vitriol is CuSO4.5H2O.
When blue vitriol is heated,anhydrous copper sulphate is formed ,i.e,CuSO4 which is white in colour and water vapour is released. This is a reversible change and if again CuSO4 is treated with water it forms blue vitriol,i.e,CuSO4.5H2O