This page has acidity tables for monoprotic acids and polyprotic acids. |
---|
Common Name |
Formula |
Acidity Constant |
pKa |
---|---|---|---|
perchloric acid |
HClO4 |
ca. 1010 |
ca. -10 |
hydrogen iodide |
HI |
ca. 109 |
ca. -9 |
hydrogen bromide |
HBr |
ca. 109 |
ca. -9 |
hydrogen chloride |
HCl |
ca. 107 |
ca. -7 |
nitric acid |
HNO3 |
ca. 200 |
ca. -2 |
thiocyanic acid |
HSCN |
70 |
-1.85 |
hydronium ion |
H3O+ |
55 |
-1.74 |
chloric acid |
HClO3 |
10 |
-1.0 |
iodic acid |
HIO3 |
0.18 |
0.75 |
hypophosphorous acid |
H2P(O)OH |
10-2 |
2.0 |
hydrogen fluoride |
HF |
6.6 * 10-4 |
3.2 |
nitrous acid |
HNO2 |
5.0 * 10-4 |
3.3 |
cyanic acid |
HOCN |
3.54 * 10-4 |
3.45 |
hydrazoic acid |
HN3 |
2.37 * 10-5 |
4.63 |
hypochlorous acid |
HOCl |
2.95 * 10-8 |
7.53 |
hypobromous acid |
HOBr |
2.3 * 10-9 |
8.65 |
hydrocyanic acid |
HCN |
5.8 * 10-10 |
9.25 |
ammonium |
NH4+ |
5.8 * 10-10 |
9.25 |
hypoiodous acid |
HOI |
10-10 |
10 |
hydrogen peroxide |
H2O2 |
2.5 * 10-12 |
11.6 |
water |
H2O |
1.82 * 10-16 |
15.74 |
heavy water |
D2O |
3.5 * 10-17 |
16.55 |
ammonia |
NH3 |
ca. 10-34 |
ca. 34 |
Organic Chemistry
|
Common Name |
Formula |
Acidity Constant |
pKa |
---|---|---|---|
sulfuric acid |
H2SO4 |
K1 = 2.4 * 106
|
-6.62 |
chromic acid |
H2CrO4
|
K1 = 3.55
|
-0.55 |
sulfurous acid |
H2SO3
|
K1 = 1.71 * 10-2
|
1.77 |
phosphoric acid |
H3PO4
|
K1 = 7.1 * 10-3
|
2.15 |
phosphorous acid |
H3PO3
|
K1 = 1.6 * 10-2
|
1.8 |
pyrophosphoric acid |
H4P2O7
|
K1 = 3 * 10-2
|
1.52 |
carbonic acid |
H2CO3
|
K1 = 4.35 * 10-7
|
6.36 |
hydrogen sulfide |
H2S
|
K1 = 9 * 10-8
|
6.97 |
boric acid |
H3BO3
|
K1 = 7.2 * 10-10
|
9.14 |
Organic Chemistry
|