Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations

Question

A) 0.377 M
B) 0.107 M
C) 4.16*10^-2 M

Ka= 1.9*10^-5

Answer 1

..........HN3 ==> H^+ + N3^-
I.........0.377....0.....0
C.........-x.......x......x
E........0.377-x....x.....x

Ka = (H^)(N3^-)/(HN3)
Subtitute and solve for x = (H^+). Then % ion = [(H^+)/(HN3)]*100 = ?

Watch the lower cncns; they may require solving a qudratic.