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Question:

Does a change in color observed when copper(II)sulfate crystals become dehydrated?

How do you account for the color change when water is added to the heated copper(II)sulfate?

Answer:

THE COLOR CHANGES FRM BLUE TO WHITE
Copper(II )sulfate pentahydrate is blue. When it is heated, the water present in the pentahydrate evaporates. Copper slufate anhydrous remaines. It is white in color. If water is then added back and mixed with the anhydrous compound, then the color returns to blue as copper(II )sulfate pentahydrate is formed.

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