Chromic Acid

Chromic Acid (Chromium Trioxide)
CAS : 7738-94-5. CrO3
The true chromic acid name for H2CrO4, Chromium Trioxide in solution.
Properties : Dark puplish or red crystal flake. Soluble in water, alcohol, and mineral acid. Deliquescent.
Density : 1.67 - 2.82.
Melting point : 196 C.


Derivation :
- Added Sulfuric acid to a solution of Sodium dichromate and the the product is crystallized out.
- Chromite is fused with soda ash and limestone and then treated with sulfuric acid.
Grade : Technical, CP.
Hazard : Powerful oxidizing agent, may explode on contact with reducing agents, may ignite on contact with organic material. A poison. Corrosive to skin. TLV : 0.05 mg/m3 of air. A human carcinogen.
Use : Chromium Plating intermediate, medicine (caustic), process engraving, anodizing, ceramic glazes, colored glass, inks, Tanning, paints, textile mordant, etchant for plastics.

Function in Chrom Plating : Hexavalent Chromium base in Decorative Chrom Plating and Hard Chrom Plating.