What does total hardness represent?

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Multiple Choice

What does total hardness represent?

Explanation:
Total hardness is the overall concentration of hardness-causing ions in water, coming from both calcium and magnesium. It’s calculated by adding the contributions from calcium and from magnesium, usually expressed as milligrams per liter as calcium carbonate (mg/L as CaCO3). So the total is the sum of Ca2+ and Mg2+ hardness. If you only consider calcium or only magnesium, you’d miss part of what’s contributing to hardness. Also, carbonate hardness refers specifically to the portion due to bicarbonates (temporary hardness), not the entire calcium-plus-magnesium total.

Total hardness is the overall concentration of hardness-causing ions in water, coming from both calcium and magnesium. It’s calculated by adding the contributions from calcium and from magnesium, usually expressed as milligrams per liter as calcium carbonate (mg/L as CaCO3). So the total is the sum of Ca2+ and Mg2+ hardness. If you only consider calcium or only magnesium, you’d miss part of what’s contributing to hardness. Also, carbonate hardness refers specifically to the portion due to bicarbonates (temporary hardness), not the entire calcium-plus-magnesium total.

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