|
Acid
and Base Ionization Constants
|
|
|
| Acid Ionization
Constant (Ka) - the equilibrium constant for
a weak acid. |
|
Acid Ionization
Constants
|
|
Substance
|
Formula
|
Ka
|
|
Acetic Acid
|
HC2H3O2
|
1.7 x 10-5
|
|
Benzoic Acid
|
HC7H5O2
|
6.3 x 10-5
|
|
Boric Acid
|
H3BO3
|
5.9 x 10-10
|
|
Carbonic Acid
|
H2CO3
|
4.3 x 10-7
|
|
HCO3-
|
4.8 x 10-11
|
|
Cyanic Acid
|
HCNO
|
4.9 x 10-10
|
|
Formic Acid
|
HCHO2
|
1.7 x 10-4
|
|
Hydrocyanic
Acid
|
HCN
|
4.9 x 10-10
|
|
Hydrofluoric
Acid
|
HF
|
6.8 x 10-4
|
|
Hydrogen Sufate
ion
|
HSO4-
|
1.1 x 10-2
|
|
Hydrogen Sulfide
|
H2S
|
8.9 x 10-8
|
|
HS-
|
1.2 x 10-13
|
|
Hypochlorous
Acid
|
HClO
|
3.5 x 10-8
|
|
Nitrous Acid
|
HNO2
|
4.5 x 10-4
|
|
Oxalic Acid
|
H2C2O4
|
5.6 x 10-2
|
|
HC2O4-
|
5.1 x 10-5
|
|
Phosphoric Acid
|
H3PO4
|
6.9 x 10-3
|
|
H2PO4-
|
6.2 x 10-8
|
|
HPO42-
|
4.8 x 10-13
|
|
Phosphorus Acid
|
H2PHO3
|
1.6 x 10-2
|
|
HPHO3
|
7.0 x 10-7
|
|
Propionic Acid
|
HC3H5O2
|
1.3 x 10-5
|
|
Pyruvic Acid
|
HC3H3O3
|
1.4 x 10-4
|
|
Sulfurous Acid
|
H2SO3
|
1.3 x 10-2
|
|
HSO3
|
6.3 x 10-8
|
|
| Base Ionization
Constant (Kb) - the equilibrium constant for
a weak base. |
|
Base Ionization
Constants
|
|
Substance
|
Formula
|
Kb
|
|
Ammonia
|
NH3
|
1.8 x 10-5
|
|
Aniline
|
C6H5NH2
|
4.2 x 10-10
|
|
Dimethylamine
|
(CH3)2NH
|
5.1 x 10-4
|
|
Ethylamine
|
C2H5NH2
|
4.7 x 10-4
|
|
Hydrazine
|
N2H4
|
1.7 x 10-6
|
|
Hydroxylamine
|
NH2OH
|
1.1 x 10-8
|
|
Methylamine
|
CH3NH2
|
4.4 x 10-4
|
|
Pyridine
|
C5H5N
|
1.4 x 10-9
|
|
Urea
|
NH2CONH2
|
1.5 x 10-14
|
|
