WAEC - Chemistry (2017 - No. 32)
When water was added to a white anhydrous substance X, the colour changed to blue. X is
\(CuSO_{4}\)
\(FeSO_{4}\)
\(Na_{2}SO_{4}\)
\(PbSO_{4}\)
Erläuterung
When water is added to white coloured anhydrous copper sulphate, its colour changes to blue, indicating that the blue coloured copper sulphate pentahydrate is regenerated.