Which parameter is a measure of both calcium and magnesium ions in water?

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Multiple Choice

Which parameter is a measure of both calcium and magnesium ions in water?

Explanation:
Hardness in water comes from multivalent cations, mainly calcium and magnesium. Total hardness is the parameter that accounts for both Ca2+ and Mg2+ together, giving a single measure of the overall hardness. Calcium hardness and magnesium hardness represent just one ion’s contribution each, while conductivity reflects overall ion content but isn’t specific to these ions, and pH measures acidity rather than ion concentrations. Therefore, the measure that covers both calcium and magnesium ions is total hardness.

Hardness in water comes from multivalent cations, mainly calcium and magnesium. Total hardness is the parameter that accounts for both Ca2+ and Mg2+ together, giving a single measure of the overall hardness. Calcium hardness and magnesium hardness represent just one ion’s contribution each, while conductivity reflects overall ion content but isn’t specific to these ions, and pH measures acidity rather than ion concentrations. Therefore, the measure that covers both calcium and magnesium ions is total hardness.

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