What is the pH of a 0.050 M triethylamine, (C₂H₅)₃N, solution? K_b for triethylamine is 5.3 × 10^-4.

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Quizplus · Accepted Answer

Triethylamine is a weak base, and its Kb can be calculated from its given pKb (5.3 × 10^-4). The pH of a solution of a weak base can be found using the formula pH = 14 - pOH, where pOH = 1/2(pKb - log[base]). Calculating the pKb from the given Kb: pKb = -log(5.3 × 10^-4) = 3.28. Then, calculating the pOH: pOH = 1/2(3.28 - log[0.050]) = 1/2(3.28 - (-1.3)) = 2.29. Finally, calculating the pH: pH = 14 - 2.29 = 11.71, which is closest to the given option A, 11.69.

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