Dissociation Constants for Environmentally Significant Acids and Bases - Elements of Environmental Engineering: Thermodynamics and Kinetics - page 437

Appendix5

Dissociation Constants
for Environmentally
Significant Acids and
Bases

Compound K a 1 K a 2 K a 3

H 3 O + A −
[HA]

H 3 O + + A − ;

Acids: HA + H 2 O K a =

2.1 × 10 − 4 Formic acid

1.7 × 10 − 5

Acetic acid

1.4 × 10 − 5

Propionic acid

1.5 × 10 − 5

Butyric acid

1.6 × 10 − 5

Valeric acid

1.0 × 10 − 10

Phenol

6.0 × 10 − 8

2-Nitrophenol

3.0 × 10 − 9 2-Chlorophenol

6.0 × 10 − 6

2,4-Dinitrophenol

1.4 × 10 − 8

2,4-Dichlorophenol

1.0 × 10 − 6

2,4,6-Trichlorophenol

1.8 × 10 − 5

Pentachlorophenol

4.3 × 10 − 7 4.7 × 10 − 11

H 2 CO 3

1.3 × 10 − 2 6.0 × 10 − 8

H 2 SO 3

9.1 × 10 − 8 1.3 × 10 − 13 H 2 S

7.5 × 10 − 3 6.2 × 10 − 8 4.8 × 10 − 13

H 3 PO 4

7.3 × 10 − 10 1.8 × 10 − 13 1.6 × 10 − 14

H 3 BO 3

1.2 × 10 − 2 H 2 SO 4

3.5 × 10 − 4

HF

continued

437