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Why is HgI2 less soluble in water than HgCl2 ? Explain.

Why is HgI2 less soluble in water than HgCl2 ? Explain.

Grade:12th pass

1 Answers

Arun
25750 Points
6 years ago
Probably because the Hg(II) ion is about the same size as the iodide ion, so they are able to form a more stable crystal than HgCl2, where the ions are not as close to the same size. You see a similar effect in calcium sulfate (soluble) vs barium sulfate (insoluble), while calcium hydroxide is insoluble and barium hydroxide is soluble in water - all because of the size matchup of the ions.

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