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Example - Consider the titration of a 20.0-mL sample of 0.105 M CH3COOH with 0.125 M NaOH. The Ka for CH3COOH is 1.8 x 10-5. Determine each quantity: a. initial pH b. the volume of added base required to reach the equivalence point c. the pH at 5.0 mL of added base d. the pH at the half-equivalence point e. the pH at the equivalence point f. the pH after adding 5.0 mL of base beyond the equivalence point