When calcium ions are treated with aqueous sodium hydroxide, which observation is produced?

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Multiple Choice

When calcium ions are treated with aqueous sodium hydroxide, which observation is produced?

Explanation:
Calcium ions react with hydroxide ions to form calcium hydroxide, which appears as a white solid. Calcium hydroxide is only sparingly soluble in water, so you see a white precipitate. When excess sodium hydroxide is present, the solid can dissolve by forming a soluble calciumate complex with the extra hydroxide, so the white precipitate disappears as the solution becomes clear. That’s why the correct observation is a white precipitate that dissolves in excess base.

Calcium ions react with hydroxide ions to form calcium hydroxide, which appears as a white solid. Calcium hydroxide is only sparingly soluble in water, so you see a white precipitate. When excess sodium hydroxide is present, the solid can dissolve by forming a soluble calciumate complex with the extra hydroxide, so the white precipitate disappears as the solution becomes clear. That’s why the correct observation is a white precipitate that dissolves in excess base.

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