1. Calculate the pH of a mixture of 0.10 M acetic acid and 0.20 M sodium...
1. Calculate the pH of a mixture of 0.10 M acetic acid and 0.20 M sodium acetate. The pKa of acetic acid is 4.76.
2. Calculate the ratio of acetate and acetic concentrations required to prepare a pH = 5.30 buffer.
Homework Answers
[CH3COOH] = 0.10M
[CH3COONa] = 0.20M
PKa = 4.76
PH = Pka + log[CH3COONa]/[CH3COOH]
= 4.76 + log0.2/0.1
= 4.76 + 0.3010
= 5.061 >>>>>answer
2.
pH = 5.30
Pka = 4.76
PH = Pka + log[CH3COONa]/[CH3COOH]
5.30 = 4.76 + log[CH3COONa]/[CH3COOH]
log[CH3COONa]/[CH3COOH] = 5.30-4.76
log[CH3COONa]/[CH3COOH] = 0.54
[CH3COONa]/[CH3COOH] = 3.4674
[CH3COONa]:[CH3COOH] = 3.4674 : 1
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