posted by Joseph .
Calculate the pH of a 1.33 mol/L solution of HCN is the Ka value of HCN is 6.2x10^-12
Set up ionization.
Write Ka expression.
Set up ICE table.
Substitute and solve for (H^+), then convert that to pH.
I'll be glad to help you through any of it if you post your work but I am not interested in typing out the problem so you can check yuor answers.