Determine the ka of acid from data

0.25 mols of an unknown acid is dissolved in enough water to make 1 Liter of solution. The pH of the solution is 2.19. Determine the ka of the acid from this data.

a. Ka = 6.5 x 10^-3

b. Ka = 4.3 x 10^-4

c. Ka = 1.7 x 10^-4

d. Ka = 5 x 10^-2

e. Ka = 2.7 x 10^-2

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Chemistry: Determine the ka of acid from data
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