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Unformatted text preview: HA = n A – A – further accepts a proton from water – calculate pH like the pH of a salt solution • Below stoichiometric point pH calculation is like a weak acid with a salt, above, ∝ [OH – ] Example Calculate the pH at the following three points during the titration of 25 mL of a 0.1 M NH 3 solution (K b = 1.8 x 10 –5 ) with 0.2 M HCl. (1) When V added = 11 mL (2) When V added = 13 mL (3) At the stoichiometric point 3 Determination of K a HA(aq) + OH – (aq) → A – (aq) + H 2 O(l) • At stoichiometric point, n OH = initial n HA = n A • Halfway to the stoichiometric point – n OH = n A = n HA = initial n HA /2 – using total volume : [HA] = [A – ] Ka = [H 3 O + ] or pK a = pH ←...
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