The spectrum of the combined chloro and aqua cobalt complex solutions tells you_______________.
A. The chloro and aqua cobalt complexes are present in equal amounts.
B. The purple color is due to a mixture of the pink aqua complex and blue chloro complex and is not due to a new species.
C. The equilibrium has been reached and no further reactions are happening.
D. There is a new species present that has a purple color.

The pink aqua complex of cobalt can be in equilibrium with blue chloro complex of cobalt giving rise to a purple colour. This equilibrium is governed by Le Chaterliers principle. A change in chloride or water concentration could shift the equilibrium towards any of the species causing its colour to become the dominant colour of the solution.

throwdolbeau throwdolbeau · Answer 2 · 2022-02-10T13:16:33+01:00

The spectrum of the combined chloro and aqua cobalt complex solutions tells you the purple color is due to a mixture of the pink aqua complex and blue chloro complex and is not due to a new species.

Color in complexes:

Complex ions containing transition metals are usually colored, whereas the similar ions from non-transition metals are not.
The partly filled d orbitals must be involved in generating the color in some way.

The pink aqua complex of cobalt can be in equilibrium with blue chloro complex of cobalt giving rise to a purple colour.

A change in chloride or water concentration could shift the equilibrium towards any of the species causing its colour to become the dominant colour of the solution.

Thus, correct option is B.

Find more information about Transition complex here:

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