Table of dissociation constants
The table shows dissociation constants of inorganic acids and bases in aqueous solutions.
Dissociation constants of substances capable of dissociating as by type acids, and by type of base, are given respectively in two tables (Acids, Bases).
What is dissociation described in article.
Table of acid dissociation constants
| Acid |
Formula |
Т,°С |
Ка |
рКа |
| Nitrogenous (0.5 M) |
HNO2 |
18 |
4·10-4 |
3,4 |
| Peroxomonoosmic |
H2ОsО5 |
18 |
8·10-13 |
12,1 |
| Nitrogen |
HNO3 |
25 |
4,36·10 |
-1,64 |
| Stannic |
H2SnО2 |
18 |
6·10-8 |
17,2 |
| Hyponitrous acid |
H2N2O2 |
18 |
2·10-8
210-12 |
7,7
11,7 |
| Tin (meta) |
H2SnО3 |
25 |
4·10-10 |
9,4 |
| Nitric acid |
HN3 |
20 |
2,09·10-5 |
4,68 |
| Peroxodiphosphoric |
H4P2О8 |
25 |
6,61·10-6
2,09·10-8 |
5,18
7,68 |
| Aluminum (meta) |
НАlO2 |
18 |
4·10-13 |
12,4 |
| 25 |
6·10-13 |
12,22 |
| Rhenium |
HReО4 |
25 |
17,78 |
-1,25 |
| Leaden |
Н2РbО2 |
18 |
2·10-16 |
15,7 |
| Boric (meta) |
Н3ВО2 |
18 |
7,5·10-10 |
9,12 |
| Selenium |
H2SeО3 |
25 |
3,5·10-3
5 ·10-8 |
2,26
7,3 |
| Таблица 1. Acid dissociation constants |
| Acid |
Formula |
Т,°С |
Ка |
рКа |
| Boric (ortho) |
Н3ВОз |
25 |
5,8·10-10 |
9,24 |
| 20 |
1,8·1013
1,6·10-14 |
12,74 13,80 |
| Hydrogen Selenium |
H2Se |
18 |
1,7·10-4
1·10-11 |
3,77
11,0 |
| Selenic |
H2SeО4 |
25 |
1·103
1,2·10 2 |
-3
1,9 |
| Hydrobromic acid |
НВr |
25 |
1·109 |
- 9 |
| Selenocyanate |
HSeCN |
25 |
2,19·10-2 |
1,66 |
| Bromic |
НВrO3 |
18 |
2·10-1 |
0,7 |
| Sulfuric acid |
H2SО4 |
25 |
1 ·103
1,2·10-2 |
-3
1,9 |
| Hypobromous |
НВrО |
25 |
2,06·10-9 |
8,7 |
| Sulphurous |
H2SО3 |
25 |
1,58·10-2
6,3·10-8 |
1,8
7,2 |
| Vanadium (ortho) |
Н3VО4 |
25 |
3,24·10-5
1,12·10-9
7,41·10-2 |
4,49
8,95 11,13 |
| Hydrogen Sulfide |
H2S |
25 |
6·10-8
1·10-14 |
7,2
14,0 |
| Tungstic |
H2WО4 |
25 |
6,3·10-5 |
4,2 |
| Sulfamine |
NH2SО2OH |
25 |
9,77·10-2 |
1,01 |
| Таблица 1. Acid dissociation constants (continues) |
| Acid |
Formula |
Т,°С |
Ка |
рКа |
| Gallium (ortho) |
H3GaО3 |
18 |
5·10-11
2·10-12 |
10,3 11,7 |
| Superoxide of hydrogen |
HО2 |
25 |
6,3·10-3 |
2,2 |
| Hexahydroxosurmian |
H[Sb(OH)6] |
25 |
4·10-5 |
4,4 |
| Antimony (ortho) |
H3SbО4 |
18 |
4·10-5 |
4,4 |
| Hydrogen hexacyanoferrate(S) (ferruginous oxide) |
H4[Fe(CN)6] |
18 |
1·10-3 |
3,0 |
| 25 |
5,6·10 -5 |
4,25 |
| Antimony (meta) |
HSbО2 |
18 |
1·10-11 |
11,0 |
| Telluride |
H2TeО3 |
25 |
3·10-3
2·10-8 |
2,5
7,7 |
| Germanium (Meta) |
H2GeО3 |
25 |
1,7·10-9
1,9·10-13 |
8,77 12,72 |
| Hydrogen telluride |
H2Te |
25 |
1,0·10-3 |
3,0 |
| Germanium (ortho) |
H4GeО4 |
25 |
1,7·10-9
2·10-3 |
8,78
12,7 |
| Telluric (meta) |
H2TeО4
|
25 |
2,29·10-8 |
7,64 |
| 18 |
6,46·10-12 |
11,19 |
| Hypophosphoric (diphosphoric) |
H4P2O6 |
25 |
6,31·10-3 |
2,2 |
| 1,55·10-3
5,37·10-8
9,33·10-11 |
2,81
7,27 10,03 |
| Таблица 1. Acid dissociation constants (continues) |
| Acid |
Formula |
Т,°С |
Ка |
рКа |
| Hydrosulphurous (dithionic) |
H2S2O4 |
18 |
4·10-3 |
2,4 |
| Telluric (ortho) |
H6TeО6 |
25 |
2· 10-8
1,1·10-11
1·10-15 |
7,70
10,95
15 |
| Tetrabornaya |
H2B4О7 |
25 |
10-4
10-9 |
-4
-9 |
| Dimolybdenum |
H2Mo2О7 |
25 |
9,55·10-6 |
5,02 |
| Tetrafluorobornaya |
H[BF4] |
25 |
2,63 · 103 |
-2,58 |
| Dithionic |
H2S2O6 |
25 |
6,3·10-1
4,0·10-4 |
0,2
3,4 |
| Technetium |
HTcО4 |
18 |
2,29·10-1 |
0,64 |
| Diphosphoric |
H4P2O7 |
18 |
1,4·10-1 |
0,85 |
| 25 |
1,1·10-2
2,1·10-7
4,1·10-10 |
1,95
6,68
9,39 |
| Thioseric |
H2S2О3 |
25 |
2,2·10-1 2,8·10-2 |
0,66
1,56 |
| Thiocyanate (rhodane) |
HSCN |
18 |
1,4·10-1 |
0,85 |
| Dichromic |
H2Cr2О7 |
25 |
2,3·10-2 |
1,64 |
| Triphosphoric |
H5P3O10 |
25 |
1,26·10-1
8,13·10-5
1,05·10-7
1,17·10-10
|
0,9
4,09
6,98
9,93 |
| Hydrogen iodide |
HI |
25 |
1·10-11 |
-11 |
| Таблица 1. Acid dissociation constants (continues) |
| Acid |
Formula |
Т,°С |
Ка |
рКа |
| Tritiogonal |
H2CS3 |
20 |
2,09·10-3
6,03·10-9 |
2,68
8,22 |
| Iodine (ortho) |
H5IО6 |
25 |
3,09·10-2
7,08·10-9 |
1,51
8,15 |
| 16 |
2,5·10-13 |
12,60 |
| Carbon (true constant) |
H2CО3 |
25 |
1,32·10-4 |
3,88 |
| Carbon (apparent constants) |
H2CО3 |
25 |
4,45·10-7 4,69·10-11 |
6,35 10,33 |
| Iodine (meta) |
HIO4 |
25 |
2,3·10-2 |
1,64 |
| Phosphorous |
H3PО3 |
25 |
1,6·10-2
6,3 ·10-7 |
1,80
6,2 |
| Yodnovataya |
HIO3 |
18 |
1,9·10-1 |
0,72 |
| 25 |
1,7·10-1 |
0,77 |
| Phosphoric (ortho) |
H3PO4 |
25 |
7,52·10-3
6,31·10-8
1,26·10-12 |
2,12
7,20
11,9 |
| Hypophosphorous |
H3PO2 |
25 |
7,9·10-2 |
1,1 |
| Hypoiodous |
HIO |
25 |
2,29·10-11 |
10,64 |
| Hydrogen fluoride |
HF |
25 |
6,61·10-4 |
3,18 |
| Silicon (ortho) |
H4SiО4 |
25 |
2·10-10 |
9,7 |
| 30 |
2·10-12
1·10-12
1·10-12 |
11,7
12,0
12,0 |
| Таблица 1. Acid dissociation constants (continues) |
| Acid |
Formula |
Т,°С |
Ка |
рКа |
| Hydrogen fluoride (dimer) |
H2F2 |
25 |
2,63·10-3 |
2,58 |
| Fluorophosphoric |
H2[PO3F] |
25 |
2,8·10-1
1,6·10-5 |
0,55
4,80 |
| Silicon (Meta) |
H2SiО3 |
18 |
2,2·10-10
1,6·10-12 |
9,66
11,80 |
| Chloride |
HC1О2 |
18 |
5·10-3 |
2,3 |
| Xenon |
H4XeО6 |
25 |
1·10-2
1·10-6
1·10-11 |
2
6
11 |
| Hydrochloric (hydrochloric) |
HCl |
25 |
1·107 |
-7 |
| Dihydroxy(dioxo)manganese |
H2MnО4 |
25 |
7,1·10-11 |
10,15 |
| Chlorinated |
HC1О |
25 |
5,01·10-8 |
7,3 |
| Permanganic |
HMnО4 |
25 |
2·102 |
-2,3 |
| Chlorosulfonic |
ClSO3H |
20 |
2,69·1010 |
-10,43 |
| Molybdenum |
H2MoО4 |
18 |
1·10-6 |
6,0 |
| Chrome |
Н2СrO4 |
25 |
1·10
3,16·10-7 |
-1
6,50 |
| Arsenic (ortho) |
H3AsО4 |
25 |
5,98·10-3
1,05·10-7 |
2,22
6,98 |
| 18 |
3,89·10-12 |
11,41 |
| Таблица 1. Acid dissociation constants (continues) |
| Acid |
Formula |
Т,°С |
Ка |
рКа |
| Cyanogen (prussic) |
HCN |
25 |
7,9·10-10 |
9,1 |
| Cyanide |
HCNO |
18 |
1,2·10-4 |
3,92 |
| Arsenic (ortho) |
H3AsО3 |
25 |
610-10 |
9,2 |
| 16 |
1,7·10-14 |
13,77 |
| 1,3,5-Triazine-2,4,6-triol |
H3C3N3O3 |
25 |
1,8 ·10-7 |
6,75 |
| Cyclotrimetaphosphoric |
H3P3O9 |
25 |
8,91 ·10-3 |
2,05 |
| Arsenic (meta) |
HAsО2 |
25 |
6·10-10 |
9,2 |
| Cyclotetrametaphosphoric |
H4P4O12 |
25 |
1,66· 10-3 |
2,78 |
| Hydrogen peroxide |
H2О2 |
30 |
2,63·10-12 |
11,58 |
| 18 |
1·10-25 |
25,0 |
| Таблица 1. Acid dissociation constants (continues) |
Table of base dissociation constants
| Base |
Formula |
Т,°С |
Кb |
рКb |
| Aluminum Hydroxide |
Аl(ОН)3 |
25 |
1,38·10-9 |
8,86 |
| Ammonia hydrate (true constant) |
NH3 · Н2О |
25 |
6,3·10-5 |
4,20 |
| Ammonia hydrate (apparent constant) |
NH3 ·Н2О |
25 |
1,79·10-5 |
4,75 |
| Barium hydroxide |
Ва(ОН)2 |
25 |
2,3·10-1 |
0,64 |
| Vanadium(III) hydroxide |
V(OH)3 |
25 |
8,3·10-12 |
11,08 |
| Gallium(III) hydroxide |
Ga(OH)3 |
18 |
1,6·10-11 |
10,8 |
| 4· 10-12 |
11,4 |
| Hydrazine Hydrate |
N2H4H2О |
25 |
1,2·10-6 |
5,9 |
| Hydroxylamine Hydrate |
NH2OH · H2 О |
25 |
9,33 · 10-9 |
8,03 |
| Iron(II) hydroxide |
Fe(OH)2 |
25 |
1,3·10-4 |
3,89 |
| Iron(III) hydroxide |
Fe(OH)3 |
25 |
1,82·10-11
1,35·10-12 |
10,74 11,87 |
| Cadmium(II) hydroxide |
Cd(OH)2 |
30 |
5,0·10-3 |
2,30 |
| Calcium Hydroxide |
Ca(OH)2 |
25 |
4,3 · 10-2 |
1,37 |
| Cobalt(II) hydroxide |
Co(OH)2 |
25 |
4·10-5 |
4,4 |
| Lanthanum(W) Hydroxide |
La(OH)3 |
25 |
5,0·10-4 |
3,30 |
| Lithium hydroxide |
LiOH |
25 |
6,75·10-1 |
0,17 |
| Magnesium Hydroxide |
Mg(OH)2 |
25 |
2,5·10-3 |
2,60 |
| Manganese(II) hydroxide |
Mn(OH)2 |
30 |
5,0·10-4 |
3,30 |
| Copper(II) hydroxide |
Сu(ОН)2 |
25 |
3,4 ·10-7 |
6,47 |
| Sodium hydroxide |
NaOH |
25 |
5,9 |
-0,77 |
| Nickel(II) hydroxide |
Ni(OH)2 |
30 |
2,5 ·10-5 |
4,60 |
| Plutonium(IV) hydroxide |
Pu(OH)4 |
25 |
3,2 ·10-13 |
12,49 |
| Mercury(II)hydroxide |
Hg(OH)2 |
25 |
4,0·10-12
5,0·10-11 |
11,40 10,30 |
| Lead(II) hydroxide |
Pb(OH)2 |
25 |
9,6·10-4 |
3,02 |
| Silver(I) Hydroxide |
AgOH |
25 |
1,1 ·10-4 |
3,96 |
| Scandium(III) hydroxide |
Sc(OH)3 |
25 |
7,6·10-10 |
9,12 |
| Strontium hydroxide |
Sr(OH)2 |
25 |
1,50·10-1 |
0,82 |
| Tadlium(I) hydroxide |
TlOH |
25 |
>101 |
<1 |
| Thorium(IV) hydroxide |
Th(OH)4 |
25 |
2,0·10-10 |
9,70 |
| Chromium(III) hydroxide |
Cr(OH)3 |
25 |
1,02 ·10-10 |
9,99 |
| Zinc Hydroxide |
Zn(OH)2 |
25 |
4·10-5 |
4,4 |
| Таблица 2. Base dissociation constants |
Source: New Handbook of Chemist and Technologist. Chemical equilibrium.
Properties of solutions. — St. Petersburg: ANO NPO Professional, 2004. — 998 p.
