pH and pOH

Since ionization is endothermic,

the Kw increases as temperature increases.

[H3O+] and [OH]- are

inversely related to each other.

equilibrium constant

Like ANY ________, the Kw is temperature dependent.

pure water

In ________, [H3O+] and [OH]- are equal to each other.

When an acid or base is dissolved in water,

[H3O+] and [OH]- are not equal to each other.

Acidic solution

if [H3O+] > 1.0 × 10-7, then  [OH-] < 1.0 × 10-7

Basic solution

if [OH-] > 1.0 × 10-7, then [H3O+] < 1.0 × 10-7

pOH =

log [OH-]

-log[H+]  

Log [OH-]   =  14

But

log{H+] is pH

Neutral solution

if [H3O+] = [OH-] = 1.0 × 10-7

pH=

-log [H+]