# Question #16720

As $C u S {O}_{4} \left(a q\right)$
Of course in solution, we know that the species present are $C {u}^{2 +}$ (or rather ${\left[C u {\left(O {H}_{2}\right)}_{6}\right]}^{2 +}$) and $S {O}_{4}^{2 -}$. Solutions of this complex have a truly beautiful blue colour, and macroscopic crystals of the complex may be isolated.