Formula

pKb

HSO₃^-

12.11

SO₄^2-

12.01

F^-

10.83

NO₂^-

10.65

HCOO^-

10.25

CH₃CHOHCOO^-

10.14

C₆HCOO^-

9.60

CH₃CCOO^-

9.24

CH₃CH₂COO^-

9.13

HCO₃^-

7.63

Cit^3-

7.60

HPO₄^2-

6.79

SO₃^2-

6.75

NH₃

4.75

C₆H₅O^-

4.01

Formula

pKb

CO₃^2-

3.68

PO₄^3-

1.62