HA is a weak monoprotic acid with K_a = 2.4 x 10^-6. What is [OH^-] in a 0.300 M solution of the salt, NaA?

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Quizplus · Accepted Answer

NaA is the salt of a weak acid and a strong base, so it will hydrolyze in water to form OH⁻. The hydrolysis constant Kb can be found using Kw/Ka. Kb = 1.0 x 10⁻¹⁴ / 2.4 x 10⁻⁶ = 4.17 x 10⁻⁹. Using the formula [OH⁻] = √(Kb * C), where C is the concentration of the salt, [OH⁻] = √(4.17 x 10⁻⁹ * 0.300) = 3.5 x 10⁻⁵.

HA Is a Weak Monoprotic Acid with Ka = 2

HA Is a Weak Monoprotic Acid with K_a = 2