Chrome alum
chemical compound
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.
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Properties change
It is a dark purple solid. It is normally attached to extra water molecules. It dissolves in water.
Preparation change
It is made by reducing potassium dichromate with sulfur dioxide.
Uses change
It was used in making leather; now chromium(III) sulfate is used instead.
