Weak Acid                  Formula           Ka

acetic acid                   HC2H3O2         1.80*10-5

acrylic acid                  HC3H3O2         5.50*10-5

arsenous acid               As(OH)3          6.61*10-10

benzoic acid                HC7H5O2         6.30*10-5

bromoacetic acid         HC2H2O2Br     1.29*10-3

butyric acid                 HC4H7O2         1.50*10-5

chloroacetic acid         HC2H2O2Cl     1.40*10-3

cyanic acid                  HCNO                        3.47*10-4

fluoroacetic acid         HC2H2O2F      2.60*10-3

formic acid                  HCHO2           1.80*10-4

hydrofluoric acid        HF                   6.60*10-4

nitrous acid                 HNO2              7.20*10-4

propionic acid             HC3H5O2         1.30*10-5