Total hardness is a measure of which ions?

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Multiple Choice

Total hardness is a measure of which ions?

Explanation:
Total hardness measures the concentration of divalent metal ions in water, primarily calcium and magnesium. These two ions are the main contributors to hardness, as they readily form minerals that cause scale and affect soap performance. While other dissolved substances exist, total hardness is specifically about calcium and magnesium ions, usually reported as milligrams per liter as calcium carbonate. Dissolved solids is a broader term that includes many ions beyond those that define hardness, which is why the other options don’t fit.

Total hardness measures the concentration of divalent metal ions in water, primarily calcium and magnesium. These two ions are the main contributors to hardness, as they readily form minerals that cause scale and affect soap performance. While other dissolved substances exist, total hardness is specifically about calcium and magnesium ions, usually reported as milligrams per liter as calcium carbonate. Dissolved solids is a broader term that includes many ions beyond those that define hardness, which is why the other options don’t fit.

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