The pH of a 0.132 M solution of a weak base is 10.88 at 25°C. Calculate the pH of a 0.0392 M solution of the base at 25°C.
A) 10.61
B) 11.40
C) 3.23
D) 3.39
E) 10.35

Question

Quizplus · Accepted Answer

The pH of a weak base solution can be calculated using the formula pH = 14 - pOH. First, find the pOH of the 0.132 M solution using the given pH of 10.88, which gives pOH = 3.12. Use the formula for weak bases, Kb = [OH-]^2 / [Base], to find Kb. Then, use this Kb to find the pOH of the 0.0392 M solution, and convert it to pH. The calculated pH is approximately 10.61.

The PH of a 0