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Chromate

From Academic Kids

Missing image
(NH4)2Cr2O7.JPG
A Sample of Ammonium Dichromate

Chromates and Dichromates are salts of chromic acid and dichromic acid, respectively. Chromate salts contain the chromate ion, CrO4-2, and have an intense yellow color. Dichromate salts contain the dichromate ion, Cr2O7-2, and have an intense orange color.

Characteristics

2 CrO42- + 2 H3O+ → Cr2O72- + 3 H2O
This equilibrium can be pushed towards dichromate by lowering the pH (making the solution more acidic) or in the other direction towards chromate by raising the pH to basic. This is a classic example of Le Chatelier's principle at work.

See also

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