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Level 117

pH Calculation Definitions


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pH
= -log10 [H?(aq)]
Kw
= [H?(aq)][OH?(aq)]
= [H?(aq)][A?(aq)] / [HA(aq)]
Ka for a weak acid HA
= [BH?(aq)][OH?(aq)] / [B(aq)]
Kb for a weak base B
pOH
= -log10 [OH?(aq)]
pH of a buffer
= pKa + log10 [salt] / [acid]
14
pH + pOH
Kw at 298 K
= 1 x 10?¹4 mol²dm?6
KaKb
Kw