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

The pH of the solution can be calculated using the formula for the hydrolysis of the methylammonium ion (CH₃NH₃⁺). First, calculate the Kₐ for CH₃NH₃⁺ using the relation Kₐ × K_b = K_w, where K_w = 1.0 × 10⁻¹⁴. Then, use the formula for pH calculation of a weak acid solution: pH = 1/2(pKₐ - log[C₀]), where C₀ is the initial concentration. This results in a pH of approximately 5.18.

Calculate the PH of a 1