The pH of the buffer solution is 9.32
From the question given above, the following data were obtained:
pKa of NH₄ = 9.24
Concentration of NH₄, [NH₄] = 0.2 M
Concentration of NH₃, [NH₃] = 0.24 M
The pH of the buffer solution can obtain by using the Henderson-Hasselbach equation as illustrated below:
pH = pKa + log [base] / [acid]
pH = pKa+ log [NH₃] / [NH₄]
pH = 9.24 + log (0.24/ 0.2)
Therefore, the pH of the buffer solution is 9.32
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