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commonioneffect

# commonioneffect - shifts equilibrium against a certain side...

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common-ion effect  - ionization of electrolyte decreases if common ion added   shifts equilibrium against a certain side Ka = [H+][common ion] / [acid] Kb = [OH-][common ion] / [base] can decrease the solubility of certain slightly soluble salts Find the pH in a solution of 0.1 M lactic acid and 0.1 M sodium lactate   Given: o Ka of lactic acid = 1.4 x 10-4 o Ka = [H+][common ion] / [acid] 1.4 x 10-4 = [H+] x 0.1 / 0.1 1.4 x 10-4 = [H+] pH = -log [H+] = 3.85 Find the pH of a 500mL solution containing 1.00 g propionic acid and 1.0 g sodium propionate   Given: o Ka of propionic acid = 1.3 x 10-5 o propionic acid = HC3H5O2 o sodium propionate = NaC3H5O2 o Ka = [H+][common ion] / [acid] [propionic acid] = 1 / (1+36+5+32) / 0.5 = 0.027 [sodium propionate] = 1 / (23+36+5+32) / 0.5 = 0.0208 1.3 x 10-5 = [H+] [sodium propionate] / [propionic acid] [H+] = 1.68 x 10-5 pH = -log[H+] = 4.77 complex ions

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