Chromium (III) Oxide – Cr2O3 – 100 g
Chemical formula: Cr2O3
Synonyms: Chromium sesquioxide, Chromia, Chrome green, Eskolaite (mineral)
Amount: 100 g
Appearance and odour: green powder, without appreciable odour
Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labelled. Bottle and cap are UN approved and reusable.
Description and uses:
The main oxide of chromium. Amphotheric in character, it forms both stable hydrated cations (Cr3+) and chromite (‘CrO2 (-)’) anions.
Fused with potassium hydroxide and a strong oxidiser (KNO3 or KClO3, usually) it is oxidised to chromate (CrO3(2-)), which on leaching and acidifying yields the much desired potassium dichromate (K2Cr2O7).
Aluminothermic reduction of Cr2O3 with aluminium powder proceeds swiftly and yields reguli of pure Cr metal.
Do NOT confuse with chromium trioxide (CrO3 (VI)).
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