HA <--> H+ + A-
Ka = [H+][A-]/[HA]
Now, if you let x = [H+] = [A-], then [HA] = 0.978 x. Then,
1.5X10^-5 = x^2 / 0.978x = x / 0.978
x = 1.47X10^-5 M
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HA <--> H+ + A-
Ka = [H+][A-]/[HA]
Now, if you let x = [H+] = [A-], then [HA] = 0.978 x. Then,
1.5X10^-5 = x^2 / 0.978x = x / 0.978
x = 1.47X10^-5 M