# Hydrates In Aqueous Solutions

Say you had copper(II) sulfate pentahydrate as a solid.

In an aqueous solution, is it still referred to by its hydrated form? Is it still called copper(II) sulfate pentahydrate (aqueous) or simply copper (II) sulfate (aqueous)?

I guess what I'm asking here is does the "hydrate" label apply exclusively to solids?

• Yes, the "hydrate" label applies exclusively to solids. Once you got your salt dissolved, there is absolutely nothing special about those water molecules that came from the solid. – Ivan Neretin Oct 11 '15 at 17:01

Yes, the ‘hydrate’ label applies exclusively to solids. Consider the following experiment: Dissolve both anhydrous $\ce{CuSO4}$ and $\ce{CuSO4 . 5 H2O}$ in water. You will get the same, blue solution.
$$\ce{CuSO4.5 H2O + H2O -> [Cu(H2O)6]^2+ + SO4^{2-}_{~(aq)}}$$