Chapter 12, Problem 116QRT

For the equilibrium

$\underset{pink}{Co{(H_{2}O)}_6^{2+}(aq)}+4C{l}^{-}(aq)\rightleftharpoons \underset{blue}{CoC{l}_4^{2-}(aq)}+6H_{2}O(\ell )$

K_c is somewhat greater than 1. If water is added to a blue solution of $CoC{l}_4^{2-}(aq)$, the color changes from blue to pink.

1. (a) Does water appear in the equilibrium constant expression for this reaction?
2. (b) How can adding water shift the equilibrium to the left?
3. (c) Is this shift in the equilibrium in accord with Le Chatelier’s principle? Why or why not?