QUESTION 9 The pH of 0.50 M acetic acid is 2.52. Calculate the change in pH...

Question

Question

Answer 1

Answer #1

mixture of CH3COONa and CH3COOH act as acidic buffer

pH = pKa + log [CH3COONa]/[CH3COOH]

pKa = - log K = - log 1.8 x 10^-5 = 4.74

[CH3COONa] = (0.91 / 82.03)(1000 / 11.1) = 0.999 M

[CH3COOH] = 0.50 M

pH = 4.74 + log [0.999]/[0.50]

pH = 4.74 + 0.30

pH = 5.04

pH change = 5.04 - 2.52 = 2.52

Answer 2

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