Table 15: Ionization equilibrium constants

A. Acids

 

Acid

Conjugate base

Ks

pKs

 

H3AsO3

H2AsO3-

4.0× 10-10

9.40

 

H2AsO3-

HASO32-

3.0× 10-14

13.52

 

H3AsO4

H2AsO4-

5.6× 10-3

2.25

 

H2AsO4-

HAsO42-

1.7× 10-7

6.77

 

HAsO42-

AsO43-

3.9× 1012

11.60

 

C6H5COOH

C6H5COO-

6.5× 10-5

4.19

 

C2H2(OH)2(COOH)2

6× 10-4

3.22

 

1.5× 10-5

4.82

 

(C2H2)2(COOH)2

6.9× 10-5

4.16

 

2.5× 10-6

5.61

 

H3BO3

H2BO3-

7.3ˇ10-10

9.14

 

H2BO3-

HBO32-

1.8ˇ10-13

12.74

 

HBO32-

BO33-

1.6ˇ10-14

13.80

 

H3C6H5O7

H2C6H5O7-

7.1ˇ10-4

3.14

 

H2C6H5O7-

HC6H5O72-

1.7ˇ10-5

4.77

 

HC6H5O72-

C6H5O73-

4.1ˇ10-7

6.39

 

Cl2CHCOOH

Cl2CHCOO-

3.3ˇ10-2

1.48

 

CH3COOH

CH3COO-

1.8ˇ10-5

4.75

 

H4Y

H3Y-

10-2

2.0

 

H3Y-

H2Y2-

1.1× 10-3

2.7

 

H2Y2-

HY3-

6.3× 10-7

6.2

 

HY3-

Y4-

5.0× 10-11

10.3

 

H3PO4

H2PO4-

7.5ˇ10-3

2.12

 

H2PO4-

HPO42-

6.2ˇ10-8

7.21

 

HPO42-

PO43-

2.2ˇ10-13

12.67

 

H3PO3

H2PO3-

10-2

2.00

 

H2PO3-

HPO32-

2.6ˇ10-7

6.59

 

C6H4(COOH)2

1.3ˇ10-3

2.89

 

3.9ˇ10-5

4.41

 

C2H2(COOH)2

9.3ˇ10-4

3.03

 

3.6ˇ10-5

4.44

 

HCOOH

HCOO-

1.8ˇ10-4

3.75

 

HCN

CN-

4.9ˇ10-10

9.31

 

HF

F-

3.5ˇ10-4

3.45

 

HClO

ClO-

3.0ˇ10-5

4.53

 

HIO3

IO3-

1.7ˇ10-1

0.77

 

H2S

HS-

1.1ˇ10-7

6.96

 

HS-

S2-

10-14

14.00

 

H2SO3

HSO3-

1.5ˇ10-2

1.81

 

HSO5

SO32-

1.0ˇ10-7

6.91

 

HSO4-

SO42-

1.2ˇ10-2

1.92

 

H2CrO4

HCrO4-

1.8ˇ10-1

0.74

 

HCrO4-

CrO42-

3.2ˇ10-7

6.49

 

ClCH2COOH

ClCH2COO-

1.4ˇ10-3

2.85

 

H2C2O4

HC2O4-

5.9ˇ10-2

1.23

 

HC2O4-

C2O42-

6.4ˇ10-5

4.19

 

H4P2O7

H3P2O7-

1.4ˇ10-1

0.85

 

H3P2O7-

H2P2O72-

3.2ˇ10-2

1.49

 

H2P2O72-

HP2O73-

1.7ˇ10-4

5.77

 

HP2O73-

P2O74-

6.0ˇ10-9

8.22

 

HIO4

IO4-

2.3ˇ10-2

1.66

 

HNO2

NO2-

4.6ˇ10-4

3.37

 

C6H4(NH2)SO3H

C6H4(NH2)SO3-

5.9ˇ10-4

3.23

 

H2CO3

HCO3-

4.3ˇ10-7

6.37

 

HCO3-

CO32-

5.6ˇ10-11

10.25

 

Cl3CCOOH

Cl3CCOO-

2.0ˇ10-1

0.70

 

B. Bases

Név Kb Ks pKs
NH3(aq) 1.8× 10-5 5.5× 10-10 9.26
Aniline 4.3× 10-10 2.3× 10-5 4.63
Atropine 4.3× 10-5 2.2× 10-10 9.65
Ba OH K2 1.0× 10-3 1.0× 10-11 11.00
Benzidine K1

K2

 4.5× 10-10

3.7× 10-11

 2.2× 10-5

2.7× 10-4

 4.66

3.57
Etilamine 6.3× 10-4 1.6× 10-11 10.81
p-Phenilene-diamine K1

K2

 1.1× 10-8

3.5× 10-12

 9.1× 10-7

2.9× 10-3

 6.04

2.54
Hidrazin. K1

K2

 1.1× 10-6

1.0× 10-14

 9.1× 10-9

1.0

 8.04

0.0
Hidroxilamin 1.1× 10-8 1.1× 10-7 6.04
Kalcium-hidroxid K2 3.7× 10-3 2.7× 10-12 11.57
Kinin. K1

K2

 1.0× 10-6

1.3× 10-10

 10-8

7.7× 10-5

 8.00

4.11
Codein 9.0× 10-7 1.1× 10-8 7.95
Coffein 4.1× 10-14 2.4× 10-1 0.61
Cocaine 2.6× 10-6 3.9× 10-9 8.41
Morfin 1.6× 10-6 6.16× 10-9 8.21
Nikotine K1

K2

 1.0× 10-6

1.3× 10-11

 9.6× 10-9

7.6× 10-4

 8.02

3.12
Papaverin 2.5× 10-8 4.0× 10-7 6.40
Piridin 1.8× 10-9 5.6× 10-6 5.25
Sztrichnin 1.8× 10-6 5.5× 10-9 8.26
Trietil-amin 1.8× 10-3 9.8× 10-12 11.01