Chrome alum

Chrome alum, also known as chromium potassium sulfate, is a chemical compound. Its chemical formula is KCr(SO₄)₂. It contains chromium, potassium, and sulfate ions. The chromium is in its +3 oxidation state.

Properties[change | change source]

It is a dark purple solid. It is normally attached to extra water molecules. It dissolves in water.

It was used in making leather; now chromium(III) sulfate is used instead.

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