Which ion forms a blue precipitate with sodium hydroxide?

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Multiple Choice

Which ion forms a blue precipitate with sodium hydroxide?

Explanation:
When you add sodium hydroxide, hydroxide ions react with metal ions to form metal hydroxide precipitates. The color of the precipitate depends on the metal ion. Copper(II) forms copper(II) hydroxide, Cu(OH)2, which appears blue as a solid. In contrast, iron(II) gives a pale green Fe(OH)2 precipitate, iron(III) gives a brown Fe(OH)3 precipitate, and calcium(II) gives a white Ca(OH)2 precipitate that isn’t colored. So the blue precipitate with NaOH points to copper(II) ions.

When you add sodium hydroxide, hydroxide ions react with metal ions to form metal hydroxide precipitates. The color of the precipitate depends on the metal ion. Copper(II) forms copper(II) hydroxide, Cu(OH)2, which appears blue as a solid. In contrast, iron(II) gives a pale green Fe(OH)2 precipitate, iron(III) gives a brown Fe(OH)3 precipitate, and calcium(II) gives a white Ca(OH)2 precipitate that isn’t colored. So the blue precipitate with NaOH points to copper(II) ions.

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