Which ion forms a green precipitate with sodium hydroxide?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which ion forms a green precipitate with sodium hydroxide?

Explanation:
When a metal ion is treated with hydroxide ions, it can form a metal hydroxide. If that hydroxide is insoluble, it appears as a precipitate, and its color helps identify the ion. Iron(II) ions form iron(II) hydroxide, Fe(OH)2, which is pale green and shows up as a green solid when NaOH is added. Copper(II) hydroxide would be blue, iron(III) hydroxide is brown, and calcium hydroxide is only sparingly soluble and doesn’t give a distinct colored solid in this standard test. So the green precipitate points to iron(II) ions.

When a metal ion is treated with hydroxide ions, it can form a metal hydroxide. If that hydroxide is insoluble, it appears as a precipitate, and its color helps identify the ion. Iron(II) ions form iron(II) hydroxide, Fe(OH)2, which is pale green and shows up as a green solid when NaOH is added. Copper(II) hydroxide would be blue, iron(III) hydroxide is brown, and calcium hydroxide is only sparingly soluble and doesn’t give a distinct colored solid in this standard test. So the green precipitate points to iron(II) ions.

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