Question

The chemical used to soften hard water is _________________. Fill in the Blank.

Answer 1

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The chemicals used to soften hard water include calcium hydroxide (slaked lime) and sodium carbonate (soda ash)

Answer 2

The chemical used to soften hard water is calcium hydroxide.

Hard water is the water which has dissolved magnesium and calcium salts due to which hardness is caused and it is rendered unfit for household use.

Softening is a method through which the dissolved salts are removed.

It is done so either by the addition of chemicals which form precipitate that is insoluble or ion exchange.