Question

The degree of hardness of water is usually expressed in terms of

• A. ppm by weight of $MgSO_{4}$
• B. $g/L$ of $CaCO_{3}$ and $MgSO_{3}$ present
• C. $ppm$ by weight of $CaCO_{3}$ irrespective of whether it is actually present
• D. $ppm$ of $CaCO_{3}$ actually present in water

Answer 1

Answer: (C)

$ppm$ by weight of $CaCO_{3}$ irrespective of whether it is actually present

Answer 2

Degree of hardness of water is measured in terms of ppm by weight of $CaCO_{3}$ irrespective of whether it is actually present or not.