3 years ago

Calculate the pH of a buffer that is 0.13 M in lactic acid and 0.11 M in sodium lactate

1 answer:

5 0

Acidity of lactic acid = pKa = 3.85
Ca = 0.13M
Cs = 0.11M
Henderson-Hasselbalch equation:
pH = pKa + log(Cs/Ca)
pH = 3.85 + log(0.11M/0.13M) = 3.85 + log0,846 = 3.85 - 0.073 = 3.777

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