dichromate

[ dahy-kroh-meyt ]

Phonetic (Standard)IPA

noun

Chemistry. a salt of the hypothetical acid H 2 Cr 2 O 7 , as potassium dichromate, K 2 Cr 2 O 7 .

dichromate

/ daɪˈkrəʊmeɪt /

any salt or ester of dichromic acid. Dichromate salts contain the ion Cr 2 O 7 ^2– Also calledbichromate

First recorded in 1860–65; di- ¹ + chromate

The dichromate is first dissolved, and the acid added gradually.

On boiling it with copperas it becomes violet, while on boiling with potassium dichromate it changes to a yellowish brown.

Potassium dichromate, 3/8 oz.; hot water, 1/2 pint; dissolve, and add all together.

Potassic dichromate (bichromate of potash: bichrome) contains potassium, chromium, and oxygen.

Potassium dichromate might therefore be called potassium pyrochromate.

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