An unknown acid is dissolved in water the solution is, Chemistry

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An unknown acid is dissolved in water the solution is

1. A 0.10 M solution of the weak acid HA has a pH of 2.96. What is the percent dissociation of HA in this solution? What is Ka for HA?

2. An unknown acid is dissolved in water. The solution is divided into two equal parts and one part is titrated to a phenolphthalein end point with NaOH solution. The two solutions are then mixed and the resulting pH is found to be 3.25. What is the Ka of the unknown acid?

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