Acetic acid (CH3COOH) is a monoprotic weak acid with a Ka of 1.8*10-5. A 100.0 mL sample with an unknown concentration of acetic acid

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monoprotic-weak-acid

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Acetic acid (CH3COOH) is a monoprotic weak acid with a Ka of 1.8*10-5. A 100.0 mL sample with an unknown concentration of acetic acid (60.1 g/mol) was titrated with 0.0266 M NaOH. It required 50.00mL of titrant to reach the equivalence point.

a)Calculate the pH of the solution before any base was added.
b) Calculate the pH of the solution after adding 40mL of base.

Answer:

a) pH=1.88
b) pH=4.65