Why do aqueous solutions of #Cr^(2+)# usually appear violet instead of blue?

1 Answer
Feb 11, 2017

Answer:

There MAY have been due to the oxidation of the chromous salt.

Explanation:

#[Cr(OH_2)_6]^(2+)# as far as I know is a beautiful blue salt. In solution, partial oxidation to #[Cr(OH_2)_6]^(3+)# occurs which is red-violet in colour. So the colour you see is the result of #Cr^(2+)(aq)# and #Cr^(3+)(aq)# ions..........