Chemical formula: Cr2(SO4)3.12H2O
Synonyms: chromium sulphate dodecahydrate, sulphate of chromium
Amount: 100 g
Appearance and odour: purple crystalline material without appreciable odour
Grade: 99 %
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: one of the most important, highly water soluble chromic (Cr III) compounds. Industrially used as a tanning agent.
Combined with potassium sulphate it forms a typical alum (chromium alum - KCr(SO4)2.12H2O) which crystallises into large, purple octagonal crystals.
With strong alkali chromium hydroxide (Cr(OH)3) is precipitated but due to chromium’s amphoterism this dissolves in excess alkali to blue-green chromite (Cr(OH)4(-)), showing strong similarity with aluminium in that respect. Chromite can be oxidised easily with hydrogen peroxide, to yellow chromate (CrO4(2-)), a Cr VI compound. On acidification the dichromate ion - Cr2O7(2-) is then formed.
Cr III compounds can be reduced by means of zinc powder (available from this seller) in acidic conditions, to form the poorly stable Cr2+ ion.
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