Water hardness is defined by which ions?

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Prepare for the ADEQ Water Treatment Grade 4 Exam. Benefit from multiple choice questions, real-life scenarios, and detailed explanations. Boost your chances of success!

Multiple Choice

Water hardness is defined by which ions?

Explanation:
Water hardness comes from dissolved calcium and magnesium ions. These two positively charged ions, Ca2+ and Mg2+, enter water from minerals in rocks and soil. Their presence makes water hard, affects soap performance, and can lead to scale buildup in pipes and equipment. The other ions listed—sodium, chloride, potassium, nitrate, sulfate, and phosphate—are common in water but do not define hardness. So the ions that define water hardness are calcium and magnesium.

Water hardness comes from dissolved calcium and magnesium ions. These two positively charged ions, Ca2+ and Mg2+, enter water from minerals in rocks and soil. Their presence makes water hard, affects soap performance, and can lead to scale buildup in pipes and equipment. The other ions listed—sodium, chloride, potassium, nitrate, sulfate, and phosphate—are common in water but do not define hardness. So the ions that define water hardness are calcium and magnesium.

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