What is the pH of a 0.20 M solution of NH₄Cl? [K_b(NH₃)= 1.8 × 10^-5] A)3.74 B)4.98 C)6.53 D)9.02 E)10.25

Name: What is the pH of a 0.20 M solution of NH 4 Cl? [K b (NH 3 )= 1.8 × 10 -5 ] A)3.74 B)4.98 C)6.53 D)9.02 E)10.25
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Quizplus · Accepted Answer

NH4Cl is a salt of a weak base (NH3) and a strong acid (HCl). It hydrolyzes in water to form NH4+ and Cl-. NH4+ acts as a weak acid. Using the formula pH = 1/2(pKw + pKa - log C), where pKw = 14 and pKa = 14 - pKb, we find pH ≈ 4.98.

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