Aqueous Equilibrium Constants Chart
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1
2AQUEOUS EQUILIBRIUM CONSTANTS
TABLE D.1
•
Dissociation Constants for Acids at 25 ˚C
Name
Formula
K
K
K
a1
a2
a3
Acetic acid
CH
COOH (or HC
H
O
)
-5
1.8 * 10
3
2
3
2
-3
-7
-12
Arsenic acid
H
AsO
5.6 * 10
1.0 * 10
3.0 * 10
3
4
Arsenous acid
-10
H
AsO
5.1 * 10
3
3
Ascorbic acid
H
C
H
O
8.0 * 10
-5
1.6 * 10
-12
2
6
6
6
Benzoic acid
-5
C
H
COOH (or HC
H
O
)
6.3 * 10
6
5
7
5
2
Boric acid
-10
H
BO
5.8 * 10
3
3
Butanoic acid
-5
C
H
COOH (or HC
H
O
)
1.5 * 10
3
7
4
7
2
Carbonic acid
-7
-11
H
CO
4.3 * 10
5.6 * 10
2
3
Chloroacetic acid
CH
ClCOOH (or HC
H
O
Cl)
1.4 * 10
-3
2
2
2
2
Chlorous acid
HClO
1.1 * 10
-2
2
Citric acid
HOOCC(OH) (CH
COOH)
(or H
C
H
O
)
7.4 * 10
-4
1.7 * 10
-5
4.0 * 10
-7
2
2
3
6
5
7
Cyanic acid
HCNO
3.5 * 10
-4
Formic acid
HCOOH (or HCHO
)
1.8 * 10
-4
2
1.9 * 10
-5
Hydroazoic acid
HN
3
4.9 * 10
-10
Hydrocyanic acid
HCN
6.8 * 10
-4
Hydrofluoric acid
HF
HCrO
-
-7
Hydrogen chromate ion
3.0 * 10
4
-12
Hydrogen peroxide
H
O
2.4 * 10
2
2
HSeO
-
-2
Hydrogen selenate ion
2.2 * 10
4
-8
-19
Hydrogen sulfide
H
S
9.5 * 10
1 * 10
2
-9
Hypobromous acid
HBrO
2.5 * 10
-8
Hypochlorous acid
HClO
3.0 * 10
-11
Hypoiodous acid
HIO
2.3 * 10
-1
Iodic acid
HIO
1.7 * 10
3
-4
Lactic acid
CH
CH(OH)COOH (or HC
H
O
)
1.4 * 10
3
3
5
3
Malonic acid
CH
(COOH)
(or H
C
H
O
)
1.5 * 10
-3
2.0 * 10
-6
2
2
2
3
2
4
Nitrous acid
HNO
4.5 * 10
-4
2
Oxalic acid
(COOH)
(or H
C
O
)
5.9 * 10
-2
6.4 * 10
-5
2
2
2
4
Paraperiodic acid
H
IO
2.8 * 10
-2
5.3 * 10
-9
5
6
Phenol
C
H
OH (or HC
H
O)
1.3 * 10
-10
6
5
6
5
7.5 * 10
-3
6.2 * 10
-8
4.2 * 10
-13
Phosphoric acid
H
PO
3
4
1.3 * 10
-5
Propionic acid
C
H
COOH (or HC
H
O
)
2
5
3
5
2
3.0 * 10
-2
4.4 * 10
-3
2.1 * 10
-7
Pyrophosphoric acid
H
P
O
4
2
7
-3
-9
Selenous acid
H
SeO
2.3 * 10
5.3 * 10
2
3
-2
Sulfuric acid
H
SO
Strong acid
1.2 * 10
2
4
-2
-8
Sulfurous acid
H
SO
1.7 * 10
6.4 * 10
2
3
-3
Tartaric acid
HOOC(CHOH)
COOH (or H
C
H
O
)
1.0 * 10
2
2
4
4
6
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