An acid HA has Ka = 2.28 x 10^-4. The % ionisation of this acid in a 0.170 M solution of the acid in water is?

Question

An acid HA has Ka = 2.28 x 10^-4. The % ionisation of this acid in a 0.170 M solution of the acid in water is closest to
a. 2.930 %
b. 3.662 %
c. 2.564 %
d. 0.498 %
e. 0.436 %
f. 0.623 %

I got b for the answer.. but not sure for it.. please help, thanks !!

Answer 1

I worked this in my head and b looks right to me. Hope I didn't miss anything.

Answer 2

Thanks! Really appreciate it!