when you add water to anhydrous copper(II) sulphate does it turn blule again?
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Yes, you will form blue hydrated copper(II) sulphate, CuSO4 (5H2O)
When you add water to anhydrous copper(II) sulphate it turns blue because it becomes hydrous copper(II) sulphate. Then, if you add water further, it will remain blue, may be a little darker.
Anhydrous Copper Sulphate
Yes. anhydrous copper(II) sulphate are in the form of crystals of white. on addin water, we get CuSO4.5H2O (hydrated copper(II) sulphate) which has crystals of blue. blue color is removed when CuSO4 is, for instance, acted upon by conc. sulphuric acid and it is only due to the reducin action of H2SO4 that the absence of color is witnessed, temporarily, since it can be acquired back by reaction of 5 parts of H20 for every one part of the anhydrous compound.
