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Ammonium Dichromate – (NH4)2Cr2O7- 99 % – 100 g or 200 g

Chemical formula: (NH4)2Cr2O7

!!! Important Customer Notice !!!

Due to the impending Europe-wide ban on dichromates (concerns about hexavalent chromium being a carcinogen) ammonium dichromate is now permanently out of stock. We still offer potassium dichromate, please follow the link below:

Potassium Dichromate product page (link)

Synonyms: potassium dichromate (VI), chrome mordant.

Amount: 100 g or 200 g. Please select size below, before checking out.

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.

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

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

On strong but thorough heating ammonium dichromate decomposes to Cr2O3, water and nitrogen.

Dispatch: depending on time of receipt of your order, your item will be dispatched either same day or next day at the latest.

Feedback & Complaints: not happy about something? Let us know and we’ll bend over backwards to overcome the problem.

Returns: returns are accepted on condition the item is returned to us, return cost paid by the buyer. For broken or demonstrably faulty items either replacement or refund will be issued.

CAS: 7779-09-5

Price: £7.79

Size: + Size Chart