The equation for the hydration of anhydrous copper (II) sulfate is shown.
CuSO$_4$ + 5H$_2$O $\rightarrow$ CuSO$_4$ $\cdot$ 5H$_2$O
Which colour change is observed in this reaction?
1 )
blue to white
white to blue
3 )
pink to blue
4 )
blue to pink
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