Table of Acid and Base Strength
Ka |
Acid |
Base |
||
Name |
Formula |
Formula |
Name |
|
Large |
Perchloric
acid |
HClO4 |
ClO4 - |
Perchlorate ion |
3.2 * 109 |
Hydroiodic
acid |
HI |
I- |
Iodide |
1.0 * 109 |
Hydrobromic acid |
HBr |
Br- |
Bromide |
1.3 * 106 |
Hydrochloric acid |
HCl |
Cl- |
Chloride |
1.0 * 103 |
Sulfuric acid |
H2SO4 |
HSO4 - |
Hydrogen sulfate ion |
2.4 * 101 |
Nitric acid |
HNO3 |
NO3 - |
Nitrate ion |
-------- |
Hydronium
ion |
H3O+ |
H2O |
Water |
5.4 * 10-2 |
Oxalic acid |
HO2C2O2H |
HO2C2O2- |
Hydrogen oxalate ion |
1.3 * 10-2 |
Sulfurous acid |
H2SO3 |
HSO3 - |
Hydrogen sulfite ion |
1.0 * 10-2 |
Hydrogen sulfate ion |
HSO4 - |
SO4 2- |
Sulfate ion |
7.1 * 10-3 |
Phosphoric acid |
H3PO4 |
H2PO4 - |
Dihydrogen
phosphate ion |
7.2 * 10-4 |
Nitrous acid |
HNO2 |
NO3 - |
Nitrite ion |
6.6 * 10-4 |
Hydrofluoric acid |
HF |
F - |
Fluoride ion |
1.8 * 10-4 |
Methanoic
acid |
HCO2H |
HCO2 - |
Methanoate
ion |
6.3 * 10-5 |
Benzoic acid |
C6H5COOH |
C6H5COO- |
Benzoate ion |
5.4 * 10-5 |
Hydrogen oxalate ion |
HO2C2O2- |
O2C2O2 2- |
Oxalate ion |
1.8 * 10-5 |
Ethanoic
acid |
CH3COOH |
CH3COO |
Ethanoate
(acetate) ion |
4.4 * 10-7 |
Carbonic acid |
CO3 2- |
HCO3 - |
Hydrogen carbonate ion |
1.1 * 10-7 |
Hydrosulfuric acid |
H2S |
HS- |
Hydrogen sulfide ion |
6.3 * 10-8 |
Dihydrogen
phosphate ion |
H2PO4 - |
HPO4 2- |
Hydrogen phosphate ion |
6.2 * 10-8 |
Hydrogen sulfite ion |
HS- |
S2- |
Sulfite ion |
2.9 * 10-8 |
Hypochlorous acid |
HClO |
ClO- |
Hypochlorite ion |
6.2 * 10-10 |
Hydrocyanic acid |
HCN |
CN- |
Cyanide ion |
5.8 * 10-10 |
Ammonium ion |
NH4 + |
NH3 |
Ammonia |
5.8 * 10-10 |
Boric acid |
H3BO3 |
H2BO3 - |
Dihydrogen
carbonate ion |
4.7 * 10-11 |
Hydrogen carbonate ion |
HCO3 - |
CO3 2- |
Carbonate ion |
4.2 * 10-13 |
Hydrogen phosphate ion |
HPO4 2- |
PO4 3- |
Phosphate ion |
1.8 * 10-13 |
Dihydrogen
borate ion |
H2BO3- |
HBO3 2- |
Hydrogen borate ion |
1.3 * 10-13 |
Hydrogen sulfide ion |
HS- |
S 2- |
Sulfide ion |
1.6 * 10-14 |
Hydrogen borate ion |
HBO3 2- |
BO3 3- |
Borate ion |
--------- |
water |
H2O |
|
Hydroxide |
1. Strong acids are listed at the top left
hand corner of the table and have Ka values >1
2. Acid with values less than one are considered weak.
3. The strong bases are listed at the bottom right of the table and get weaker
as we move to the top of the table.