12.3 The pH Scale and pH Calculations

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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 calculation
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