Which of the following salts is not typically a hardness-causing salt?

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Multiple Choice

Which of the following salts is not typically a hardness-causing salt?

Explanation:
Hardness in water comes from dissolved calcium and magnesium ions. Temporary hardness arises from bicarbonates of calcium and magnesium, which can be converted to carbonates and precipitated, while permanent hardness comes from sulfates and chlorides of calcium and magnesium. Sodium chloride contains only sodium and chloride ions, which do not contribute calcium or magnesium, so it does not raise water hardness. Thus, sodium chloride is not typically a hardness-causing salt. The other salts listed provide calcium or magnesium (as carbonate, bicarbonate, or sulfate), which is why they increase hardness.

Hardness in water comes from dissolved calcium and magnesium ions. Temporary hardness arises from bicarbonates of calcium and magnesium, which can be converted to carbonates and precipitated, while permanent hardness comes from sulfates and chlorides of calcium and magnesium. Sodium chloride contains only sodium and chloride ions, which do not contribute calcium or magnesium, so it does not raise water hardness. Thus, sodium chloride is not typically a hardness-causing salt. The other salts listed provide calcium or magnesium (as carbonate, bicarbonate, or sulfate), which is why they increase hardness.

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