Hard water is characterized by high concentrations of which ions?

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Study for the Grade 9 Environmental Chemistry Test. Use a blend of multiple-choice questions and detailed explanations. Master key concepts and prepare effectively!

Multiple Choice

Hard water is characterized by high concentrations of which ions?

Explanation:
Hard water is defined by high levels of multivalent metal ions, especially calcium and magnesium. These ions come from minerals in rocks like limestone and dolomite that dissolve into water. Because Ca2+ and Mg2+ have two positive charges, they interact strongly with soaps and form scale when water is heated or with carbonate ions to form calcium carbonate deposits. This is what people mean by hardness, and it’s mainly these two ions that give water its hard character. The other ions listed are not the primary contributors to hardness (they may be present, but they don’t define it in the same way).

Hard water is defined by high levels of multivalent metal ions, especially calcium and magnesium. These ions come from minerals in rocks like limestone and dolomite that dissolve into water. Because Ca2+ and Mg2+ have two positive charges, they interact strongly with soaps and form scale when water is heated or with carbonate ions to form calcium carbonate deposits. This is what people mean by hardness, and it’s mainly these two ions that give water its hard character. The other ions listed are not the primary contributors to hardness (they may be present, but they don’t define it in the same way).

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