A 0.010 M solution of a weak monoprotic acid has a pH of 3.70. What is the acid-ionization constant, Ka, for this acid?

a. 2.0 ´ 10-4

b. 2.0 ´ 10-5

c. 4.0 ´ 10-6

d. 4.0 ´ 10-7

e. 4.0 ´ 10-8

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  1. HA ==> H^+ +A^-

    Ka = (H^+)(A^-)/(HA)

    You know H^+ (from pH), A^- is the same, and you know HA. Solve for Ka.

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