Friday, 8 July 2011

Potassium Dichromate - K2Cr2O7- 99 % - 100 g

Chemical formula: K2Cr2O7

Synonyms: potassium dichromate (VI), chrome mordant.

Amount: 100 g

Appearance and odour: amber-red crystals 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: probably the most used general purpose, very strong oxidiser in inorganic chemistry. A chromium compound of oxidation state +VI.

Used in redox titrations as an oxidising titrant.

Once used in breathalysers because it oxidises alcohol(s) thereby turning green in the presence of alcohol vapour, it's still much used in the quantitative determination of alcohol in aqueous solutions by adding an excess dichromate and back titrating with Mohr's Salt (also sold by OCS). Determine the alcohol content in your favourite tipple!

Used to distinguish primary, secondary and tertiary alcohols by the reaction products of their oxidation with dichromate.

Oxidation reaction of alcohols with dichromate is also classic textbook stuff because these reactions are highly exothermic. In the presence of dilute sulphuric acid chromium alum (KCr(SO4)2.12H2O), a purple alum, is formed.

A general source of water soluble chromium ions in various states of oxidation.

In chromium Thermite (Goldschmidt - reduction with aluminium powder) reactions, potassium dichromate can be used as a heat booster, thereby increasing metal yield.

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CAS: 7778-50-9

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