What is the colour of copper sulfate solution?
Color of copper sulfate solution $\text{CuSO}_4$- Blue
Reaction involved- $\text{CuSO}_4 \rightarrow \text{Cu}^{2+} + \text{SO}_4^{2-}$
The $\text{Cu}^{2+}$ ions cause the solution to appear blue due to light absorption and reflection.