Formula

pKs

C₆H₅COOH

4.20

H₂Cit^-

4.76

CH₃COOH

4.76

CH₃CH₂COOH

4.87

H₂CO₃

6.37

H₂PO₄^-

7.21

HSO₃^-

7.25

NH₄⁺

9.25

HCO₃^-

10.32

HPO₄^2-

12.38