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Calculate the pH of a buffer containing 0.030 M HC2H3O2 and 0.050 M NaC2H3O2. The Ka...

Calculate the pH of a buffer containing 0.030 M HC2H3O2 and 0.050 M NaC2H3O2. The Ka of HC2H3O2 is 1.75 x 10-5.

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Answer #1

Calculate PKa of CH3COOH

Ka for CH3COOH = 1.75 x 10^-5

PKa = −log Ka

       = - log 1.75 x 10^-5

       = 4.76

Concentration of CH3COOH and CH3COONa are given, so we can calculate the pH of a buffer solution by using Henderson-Hasselbalch equation

pH = pKa +log[A−]/[HA]

Where

pKa = 4.76

[A-] = [CH3COO-] = 0.050 M

[HA] =[CH3COOH ] = 0.030 M

PH = pKa +log [CH3COO-]/ [CH3COOH]

PH = 4.76 + log [0.050/0.030]

PH = 4.76 + 0.22

PH = 4.98

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