A 0.075 M solution of a weak base in water has a pH = 11.21 at 25°C. Calculate the value of K_b for this base.

Name: A 0.075 M solution of a weak base in water has a pH = 11.21 at 25°C. Calculate the value of K b for this base.
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Quizplus · Accepted Answer

The pH of 11.21 corresponds to a pOH of 2.79, giving an OH⁻ concentration of 1.62 × 10⁻³ M. Using the formula Kb = [OH⁻]² / [Base], we find Kb = (1.62 × 10⁻³)² / 0.075 = 3.6 × 10⁻⁵.

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