Search

The Online Encyclopedia and Dictionary

 
     
 

Encyclopedia

Dictionary

Quotes

   
 

Chromate

(Redirected from Dichromate)

Chromates and Dichromates are salts of chromic acid and dichromic acid, respectively.

The chromium atoms are in oxidation state VI in both, and the chromate and dichromate ions are fairly strong oxidizing agents.

In an aqueous solution, yellow chromate (CrO42-) and orange dichromate (Cr2O72-) ions are in a chemical equilibrium. This equilibrium is pushed towards dichromate by lowering the pH (making the solution more acidic) - a classic demonstration of Le Chatelier's principle.

2 CrO42- + 2 H3O+ → Cr2O72- + 3 H2O

They are used in environmental analysis to measure chemical oxygen demand (COD).

They are carcinogenic.

Last updated: 05-14-2005 14:14:05