Chromium(III) sulfate

Chromium(III) Sulfate

Chromium(III) sulfate

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Chromium(III) sulfate usually refers to the inorganic compound with the formula Cr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> • 12(H<sub>2</sub>O). This consists of the hydrated sulfate salt of the metal aquo complex with the formula <sup>3+</sup>, which is responsible for the purple color of this salt. It is widely used in the tanning of leather, with associated environmental damage.


Heating chromium(III) sulfate leads to partial dehydration to give a hydrated green salt (CAS#10031-37-5) and eventually the anhydrous derivative (CAS#10101-53-8).


Basic chromium sulfate is produced from chromate salts by reduction with sulfur dioxide, although other methods exist. The hydrous form may be formed by the reaction of chromium oxide and sulfuric acid.
Cr<sub>2</sub>O<sub>3</sub> + 3 H<sub>2</sub>SO<sub>4</sub> → Cr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> + 3 H<sub>2</sub>O


Chromium sulfate
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