which is

Equilibrium constants for ionization reactions are usually called ionization or dissociation constants, often designated Ka. The dissociation constants of some acids are given in Figure 2-16. Stronger acids, such as phosphoric and carbonic acids, have larger dissociation constants; weaker acids, such as monohydrogen phosphate (HPO4"), have smaller dissociation constants.

Monoprotic acids

Acetic acid

Diprotic acids

Carbonic acid


Glycine, carboxyl (Ka = 4.57 X 10-3 M); Glycine, amino (Ka = 2.51 X 10-10 M)

Triprotic acids

Phosphoric acid (Ka = 7.25 X 10-3 M); Dihydrogen phosphate (Ka = 1.38 X 10-7 M); Monohydrogen phosphate (Ka = 3.98 X 10-13 M)

ch2cx o:


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