Question : The hardness of the water is commonly measured in terms of:
Option 1: calcium carbonate equivalents
Option 2: calcium sulphate equivalents
Option 3: magnesium carbonate equivalents
Option 4: magnesium sulphate equivalents
Correct Answer: calcium carbonate equivalents
Solution : The correct answer is calcium carbonate equivalents .
The hardness of water is typically expressed in parts per million (ppm) and evaluated in terms of calcium carbonate due to the high molecular weight of calcium carbonate (100 g/mol) and the fact that it is simpler to compute values with 100 than it is to do so for other agents that contribute to water hardness.
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