Chromium sulphite

Chromium sulphite, more commonly referred to as chromium(III) sulfate, has the chemical formula Cr2(SO4)3. It is an inorganic compound consisting of chromium ions in the +3 oxidation state coordinated with sulfate ions. The compound typically appears as violet or bluish-gray crystalline solid and may exist in hydrated forms.

Chromium(III) sulfate is sparingly soluble in water and soluble in acids and alkalis. It has a molar mass of about 392 g/mol (anhydrous form) and a density around 2.04 to 3.1 g/cm³ depending on hydration. The crystalline structure features chromium ions coordinated octahedrally, forming stable complexes with sulfate as a bidentate ligand. It is stable, with a melting point near 90-92 °C and decomposes upon boiling.

This compound finds use in tanning leather, pigment production, and as a chemical intermediate. Chromium(III) sulfate is less toxic than hexavalent chromium compounds but should still be handled with care due to chromium's potential health effects.​