What color does anhydrous copper(II) sulfate turn when it absorbs water?

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Multiple Choice

What color does anhydrous copper(II) sulfate turn when it absorbs water?

Explanation:
Water uptake changes the copper(II) sulfate from its dry, white form into the hydrated blue form. When it absorbs water, it forms copper(II) sulfate pentahydrate (CuSO4·5H2O). The blue color comes from the copper(II) ion in this hydrated complex, where the water molecules coordinated to copper alter the light absorption, giving a characteristic blue appearance. So the color change from white to blue is a clear sign of hydration.

Water uptake changes the copper(II) sulfate from its dry, white form into the hydrated blue form. When it absorbs water, it forms copper(II) sulfate pentahydrate (CuSO4·5H2O). The blue color comes from the copper(II) ion in this hydrated complex, where the water molecules coordinated to copper alter the light absorption, giving a characteristic blue appearance. So the color change from white to blue is a clear sign of hydration.

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