Calculate the pH of a 1.60 M CH₃NH₃Cl solution.K_b for methylamine,CH₃NH₂,is 3.7 × 10^-⁴. A) 1.61 B) 5.18 C) 8.82 D) 12.39

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Quizplus · Accepted Answer

CH₃NH₃Cl is the salt of a weak base (CH₃NH₂) and a strong acid (HCl). It hydrolyzes in water to form CH₃NH₃⁺, which acts as a weak acid. The Kₐ for CH₃NH₃⁺ can be calculated using Kₐ = Kw / Kb. Using Kₐ, the concentration of H⁺ can be found, and then the pH is calculated. The pH is approximately 5.18.

Calculate the PH of a 1