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Hardness in water is expressed in terms of ____________ equivalents.

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Hardness in water is expressed in terms of ____________ equivalents.

(a) Calcium carbonate

(b) Calcium bicarbonate

(c) Magnesium hydroxide

(d) Magnesium oxide

I have been asked this question in a national level competition.

My question is from Problems, Units and Formulae topic in section Water of Applied Chemistry

1 Answer

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Right answer is (a) Calcium carbonate

The explanation: Hardness of the water is expressed in terms of the calcium carbonate equivalents. They are like ppm, degree Clark and French unit.

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