Acids and Bases: The ionic product of water, Kw

Question 1

What is the equilibrium expression for the dissociation of water?

Answer 1

Kc=[H+][OH-]/[H2O]

Question 2

Why is [H2O] not included in Kw?

Answer 2

Conc. water is very large, so effectively constant.
Therefore it is incorporated into the Kw value

Question 3

How does the value of Kw change with temperature?

Answer 3

Increasing temp increases Kw value as equilibrium shifts right, so more dissociation, so bigger conc. of H+ and OH-