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Chromium III hydroxide is highly insoluble in distilled water but dissolves readily in either acidic or...

Chromium III hydroxide is highly insoluble in distilled water but dissolves readily in either acidic or basic solution. Briefly explain why the compound can dissolve in acidic or in basic but not in neutral solution. Write appropriate equation to support your answer.
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Answer #1

In acidic solution, Cr(OH)3 reacts with excess H+ ions present to form soluble Cr3+ ions:

Cr(OH)3(s) + 3 H+(aq) => Cr3+(aq) + 3 H2O(l)

In basic solution, Cr(OH)3 reacts with excess OH- ions present to form a soluble Cr(OH)4- complex:

Cr(OH)3(s) + OH-(aq) => Cr(OH)4-(aq)

Distilled water is neutral. The concentrations of H+ and OH- ions are very low. Thus Cr(OH)3 does not undergo any reaction and remains in its insoluble Cr(OH)3 form.

Cr(OH)3(s) + H2O(l) => no reaction

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