Chromium(III) sulfate, with the chemical formula Cr2(SO4)3, is an inorganic compound containing chromium in its +3 oxidation state. It is a dark green crystalline solid and is one of the common chromium salts.

Preparation of Chromium(III) Sulfate: Chromium(III) sulfate can be prepared by the reaction of chromium(III) hydroxide (Cr(OH)3) or chromium(III) oxide (Cr2O3) with sulfuric acid (H2SO4):

2 Cr(OH)3 + 3 H2SO4 → Cr2(SO4)3 + 6 H2O

Cr2O3 + 3 H2SO4 → Cr2(SO4)3 + 3 H2O

Properties and Uses of Chromium(III) Sulfate:

• Appearance: Chromium(III) sulfate is a dark green crystalline solid.
• Solubility: It is sparingly soluble in water, but its solubility increases in acidic conditions.
• Catalyst: Chromium(III) sulfate can act as a Lewis acid catalyst in certain organic reactions.
• Pigments: Some chromium(III) compounds, including chromium(III) sulfate, are used as pigments in ceramics, paints, and inks.
• Tanning Industry: It has been used in the leather tanning industry.

Safety Considerations: Chromium(III) sulfate is generally considered to be of low toxicity. However, like other chromium compounds, it should be handled with care, and safety precautions should be followed. Avoid inhaling the dust and prevent skin contact by wearing appropriate personal protective equipment (PPE).

As with all chemicals, it is essential to consult the Material Safety Data Sheet (MSDS) and follow strict safety protocols when working with chromium(III) sulfate.