If a solution initially contains (9.5x10^-2) M of HC2H3O2, (and no H3O+ or C2H3O2– ),what is the equilibrium concentration of H3O+ (aq) in the mixture?
HC2H3O2 = HAc
..........HAc + H2O--> H3O^+ + Ac^-
I.......0.095...........0......0
C.........-x............x......x
E.....0.095-x...........x......x
Substitute the E line into the Ka expression for HAc and solve for x = (H3O^+).