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titration curve - No equilibrium calculations necessary...

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mL of base pH buffer zone a “type 2” calculation The START of the titration is the same as a regular (type 1) weak acid problem. You know K a and [HA] so you can calculate pH. HA H + + A - The equivalence point (endpoint) is the same as a regular (type 1) salt of a weak acid problem (NaA). You know [A - ] and you can calculate pH. Also note that the pH must be greater than 7 due to the hydrolysis of A - . A - + H 2 O HA + OH - This region is calculated simply by determining the amount of OH - in EXCESS that has been added.
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Unformatted text preview: No equilibrium calculations necessary. overshoot pH = 7.00 pH = 7.00 conjugate ratios are known, use Henderson-Hasselbach to calculate pH. Titration Curve weak acid with strong base McCord © 2002 pH = p K a endpoint (complete titration) half titration The half-way point is important! After you have determined the equivalence point (endpoint) of the titration, go to half that value. The pH at the half-titration point is equal to the p K a of the weak acid....
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