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Which one of the following processes wil...

Which one of the following processes will produce hard water?

A

Saturation of water with `CaCO_3`

B

Saturation of water with `MgCO_3`

C

Saturation of water with `CaSO_4`

D

Addition of `Na_2SO_4`, to water

Text Solution

Verified by Experts

The correct Answer is:
C

Alkaline earth metal salts cause hardness. Temporary hardness is caused by soluble Ca and Mg hydrogen carbonates. Soluble sulphates and chlorides of calcium and magnesium cause permanent hardness.
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