How to calculate the pH of 0.120 M of HClO2? plssss i need the answer asap.

Answer 1

........HClO2 + H2O ==> H3O^+ + ClO2^-
I.....0.120..............0.......0
C........-x..............x.......x
E.....0.120-x............x.......x

Substitute the E line into the Ka expression for HClO2 and solve for x = (H^+), then convert to pH = -log(H^+)