Calculate the pH of a buffer prepared by dissolving 0.10 mol of NH₄Cl in 1.00 L of 0.15 M NH₃. K _b = 1.8×10^{- 5} for NH₃.

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Quizplus · Accepted Answer

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([base]/[acid]). First, calculate pKa from pKb: pKa = 14 - pKb = 14 - (-log(1.8×10^-5)) = 9.25. Then, use the concentrations: [NH3] = 0.15 M, [NH4+] = 0.10 M. pH = 9.25 + log(0.15/0.10) = 9.43.

Calculate the PH of a Buffer Prepared by Dissolving 0