What color change would you observe in the dehydration of copper(II) sulfate pentahydrate?

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Multiple Choice

What color change would you observe in the dehydration of copper(II) sulfate pentahydrate?

Explanation:
The color change is due to the hydration state of copper(II) sulfate. In the pentahydrate, water molecules are coordinated to the copper ion, giving a blue color. When heated, these water molecules are driven off, forming anhydrous copper sulfate, which is white. So you observe blue crystals turning white as the hydrate loses water; if you rehydrate it, the blue color returns.

The color change is due to the hydration state of copper(II) sulfate. In the pentahydrate, water molecules are coordinated to the copper ion, giving a blue color. When heated, these water molecules are driven off, forming anhydrous copper sulfate, which is white. So you observe blue crystals turning white as the hydrate loses water; if you rehydrate it, the blue color returns.

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