Cambridge IGCSE 0620 · Chemistry

Question
Hydrated copper(II) sulfate is blue. When heated it forms white anhydrous copper(II) sulfate and water vapour. Adding water to the white solid turns it blue again. This is a reversible reaction: CuSO4·5H2O ⇌ CuSO4 + 5H2O.
[3 marks] Describe / Explain
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