K_b for NH₃is 1.8 × 10^-5. What is the pH of a 0.45 M aqueous solution of NH₄Cl at 25.0 °C?

Name: K b for NH 3 is 1.8 × 10 -5 . What is the pH of a 0.45 M aqueous solution of NH 4 Cl at 25.0 °C?
Brand: Quizplus
Rating: 4.8 (48 reviews)

Question

Quizplus · Accepted Answer

NH4Cl is a salt of a weak base (NH3) and a strong acid (HCl). The pH of the solution is determined by the hydrolysis of NH4+, which acts as a weak acid. Using the Kb of NH3, we can find the Ka of NH4+ and then calculate the pH. The correct pH is approximately 4.80.

Kb for NH3 is 1

K_b for NH₃is 1