12.3 The pH Scale and pH Calculations
Autoionization of Water
2H2O(l) ⇌ H3O+(aq) + OH-(aq)
Kw = 1.0×10-14 = [H30+][OH-]
| pH Calculations | |
|---|---|
| pH = -log[H+] | [H+] = 10-pH |
| pOH = -log[OH-] | [OH-] = 10-pOH |
| pH + pOH = 14 | [H+][OH-] = 1×10-14 |
| pH Scale |
|---|
 |
| [H+] | pH | [OH-] | pOH |
|---|---|---|---|
| 1×10-7M | |||
| 3 | |||
| 3.2×10-11M | |||
| 2.5 |
pH Calculations for Strong Acids and Bases
Determine the pH of the following solutions:
0.010M HCl
0.010M NaOH
0.10M H2SO4
0.10M Ba(OH)2