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Anhydrous magnesium sulphate is used for...

Anhydrous magnesium sulphate is used for drying solvents but anhydrous calcium sulphate cannot used . Why so ?

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Anhydrous `MgSO_(4)` combines with water to form `MgSO_(4) . 7H_(2)O` (Epsom salt) and hence it is used as a drying agent for drying solvents . In contrast , anhydrous `CaSO_(4)` does not combine with water to form `CaSO_(4) . 2 H_(2)O` and hence cannot be used as a drying agent .
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