Table Of Acids With Ka And Pka Values

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Table of Acids with Ka and pKa Values*
CLAS
Conjugate Base
-
Acid
HA
A
Ka
pKa
Acid Strength
Strength
-
Hydroiodic
HI
I
-
Hydrobromic
HBr
Br
-
Perchloric
HClO
ClO
Strong acids completely dissociate in aq solution
4
4
-
(Ka > 1, pKa < 1).
Hydrochloric
HCl
Cl
-
Conjugate bases of strong acids are ineffective bases.
Chloric
HClO
ClO
3
3
-
Sulfuric (1)
H
SO
HSO
2
4
4
-
Nitric
HNO
NO
3
3
+
Hydronium ion
H
O
H
O
1
0.0
3
2
-
-1
Iodic
HIO
IO
1.6 x 10
0.80
3
3
-
-2
Oxalic (1)
H
C
O
HC
O
5.9 x 10
1.23
2
2
4
2
4
-
-2
Sulfurous (1)
H
SO
HSO
1.54 x 10
1.81
2
3
3
-
2-
-2
Sulfuric (2)
HSO
SO
1.2 x 10
1.92
4
4
-
-2
Chlorous
HClO
ClO
1.1 x 10
1.96
2
2
-
-3
Phosphoric (1)
H
PO
H
PO
7.52 x 10
2.12
3
4
2
4
-
-3
Arsenic (1)
H
AsO
H
AsO
5.0 x 10
2.30
3
4
2
4
-
-3
Chloroacetic
CH
ClCOOH
CH
ClCOO
1.4 x 10
2.85
2
2
-
-4
Citric (1)
H
C
H
O
H
C
H
O
8.4 x 10
3.08
3
6
5
7
2
6
5
7
-
-4
Hydrofluoric
HF
F
7.2 x 10
3.14
-
-4
Nitrous
HNO
NO
4.0 x 10
3.39
2
2
-
-4
Formic
HCOOH
HCOO
1.77 x 10
3.75
-
-4
Lactic
HCH
H
O
CH
H
O
1.38 x 10
3.86
3
5
3
3
5
3
-
-5
Ascorbic (1)
H
C
H
O
HC
H
O
7.9 x 10
4.10
2
6
6
6
6
6
6
-
-5
Benzoic
C
H
COOH
C
H
COO
6.46 x 10
4.19
6
5
6
5
-
2-
-5
Oxalic (2)
HC
O
C
O
6.4 x 10
4.19
2
4
2
4
-
-5
Hydrazoic
HN
N
1.9 x 10
4.72
3
3
-
2-
-5
Citric (2)
H
C
H
O
HC
H
O
1.8 x 10
4.74
2
6
5
7
6
5
7
-
-5
Acetic
CH
COOH
CH
COO
1.76 x 10
4.75
3
3
-
-5
Propionic
CH
CH
COOH
CH
CH
COO
1.34 x 10
4.87
3
2
3
2
+
-6
Pyridinium ion
C
H
NH
C
H
N
5.6 x 10
5.25
5
4
5
4
2-
3-
-6
Citric (3)
HC
H
O
C
H
O
4.0 x 10
5.40
6
5
7
6
5
7
-
-7
Carbonic (1)
H
CO
HCO
4.3 x 10
6.37
2
3
3
-
2-
-7
Sulfurous (2)
HSO
SO
1.02 x 10
6.91
4
4
-
2-
-8
Arsenic (2)
H
AsO
HAsO
8/9.3 x 10
7.10/7.03
2
4
4
-7
-
1.0 x 10
/9.1 x 10
-
Hydrosulfuric
H
S
HS
7/7.04
8
2
-
2-
-8
Phosphoric (2)
H
PO
HPO
6.23 x 10
7.21
2
4
4
-
-8
Hypochlorous
HClO
ClO
3.5/3.0 x 10
7.46/7.53
-
-9
Hypobromous
HBrO
BrO
2 x 10
8.70
-
-10
Hydrocyanic
HCN
CN
6.17 x 10
9.21
-
-10
Boric (1)
H
BO
H
BO
5.8 x 10
9.23
3
3
2
3
+
-10
Ammonium ion
NH
NH
5.6 x 10
9.25
4
3
-
-10
Phenol
C
H
OH
C
H
O
1.6 x 10
9.80
6
5
6
5
-
2-
-11
Carbonic (2)
HCO
CO
4.8 x 10
10.32
3
3
-
-11
Hypoiodous
HIO
IO
2 x 10
10.70
-10
6.0 x 10
/3.0 x
2-
3-
Arsenic (3)
HAsO
AsO
9.22/11.53
4
4
-12
10
Hydrogen
-
-12
H
O
HO
2.4 x 10
11.62
2
2
2
peroxide
-
2-
-12
Ascorbic (2)
HC
H
O
C
H
O
1.6 x 10
11.80
6
6
6
6
6
6
2-
3-
-13
Phosphoric (3)
HPO
PO
4.8/2.2 x 10
12.32/12.66
4
4
-
-14
Water
H
O
OH
1.0 x 10
14.0
2
Strong bases completely dissociate in aq solution
Group I metal hydroxides (LiOH, NaOH, etc.)
(Kb > 1, pKb < 1).
Group II metal hydroxides (Mg(OH)
, Ba(OH)
, etc.)
Conjugate acids (cations) of strong bases are ineffective bases.
2
2
th
* Compiled from Appendix 5 Chem 1A, B, C Lab Manual and Zumdahl 6
Ed. The pKa values for organic acids can be found in
th
Appendix II of Bruice 5
Ed.

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