Chromate

Chromate (from the Greek chrōmās - chromium) is an inorganic compound, a salt of the metal chromium and chromic acid with the formula MCr₂O₄, where M is a metal atom, most often iron or manganese.

Chromates in powder form are gray or black crystalline substances. They are highly soluble in acids. Aqueous solutions of chromates are poisonous.

In nature, chromates are found in the composition of chromium ores, chromites and some other minerals.

Chromates are prepared by the action of a chromium mixture on chromium (III) salts.

Iron chromate is used to obtain chromium, and manganese chromate is used to determine chromium content. Chromates are used as catalysts in organic synthesis, for example, in the production of acetylene.