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Acidity and undissociated acid

Assignment:

Q1. A weak acid has a pKa of 3.654. If the solution pH is 3.741, what percentage of the acid is undissociated?

Q2. A weak acid has a pKa of 5.857. Calculate the pH of a solution in which the ratio of the concentrations of acid anion to undissociated anion ([A-]/[HA]) equals 7.555.

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