## Chemistry (4th Edition)

d)$$K_c = \frac{1}{[H^+][OH^-]}$$
1. Write the expression including all compounds of the reaction: $$K_c = \frac{[H_2O]}{[H^+][OH^-]}$$ 2. But, since $H_2O$ appears in the liquid state, its concentration is approximately constant, so it will not appear in the Kc expression: $$K_c = \frac{1}{[H^+][OH^-]}$$