Multiple choice

Temporary hardness of water is due to the presence of _____.

  1. calcium sulphate

  2. calcium bicarbonate

  3. magnesium sulphate

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Temporary hardness of the water is due to the presence of calcium bicarbonate. Water's hardness is determined by the concentration of multivalent cations in the water. Multivalent cations are cations (positively charged metal complexes) with a charge greater than 1+. Usually, the cations have the charge of 2+. Common cations found in hard water include Ca2+ and Mg2+.

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