Calculate the pH of a 0.500 M aqueous solution of NH₃. The K_b of NH₃ is 1.77 × 10^-⁵.

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Quizplus · Accepted Answer

To find the pH, first calculate the pOH using the formula: pOH = -log[OH⁻]. For NH₃, [OH⁻] can be found using the formula: [OH⁻] = √(Kb × [NH₃]). Substituting the given values, [OH⁻] = √(1.77 × 10⁻⁵ × 0.500) = √(8.85 × 10⁻⁶) ≈ 2.97 × 10⁻³. Then, pOH = -log(2.97 × 10⁻³) ≈ 2.53. Finally, pH = 14 - pOH = 14 - 2.53 = 11.47.

Calculate the PH of a 0