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Question

What salts of calcium and magnesium cause temporary hardness of boiler feed water?

A.

Chlorides

B.

Bicarbonates

C.

Nitrates

D.

Sulphites

Answer ( Option B)

Bicarbonates

Solution

Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate). The presence of the metal cations makes the water hard.

Hence, the correct option is (B).

&Key Points:-

Permanent hardness of water is caused when chlorides and sulfides of calcium and magnesium are dissolved in water.

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