Table of Acid and Base Strength Ka Acid Base Name Formula Formula Name Large 3.2 * 109 1.0 * 109 1.3 * 106 1.0 * 103 2.4 * 101 -------5.4 * 10-2 1.3 * 10-2 1.0 * 10-2 7.1 * 10-3 Perchloric acid Hydroiodic acid Hydrobromic acid Hydrochloric acid Sulfuric acid Nitric acid Hydronium ion Oxalic acid Sulfurous acid Hydrogen sulfate ion Phosphoric acid HClO4 HI HBr HCl H2SO4 HNO3 H3O+ HO2C2O2H H2SO3 HSO4 H3PO4 ClO4 IBrClHSO4 NO3 H2O HO2C2O2HSO3 SO4 2H2PO4 - 7.2 * 10-4 6.6 * 10-4 1.8 * 10-4 6.3 * 10-5 5.4 * 10-5 1.8 * 10-5 Nitrous acid Hydrofluoric acid Methanoic acid Benzoic acid Hydrogen oxalate ion Ethanoic acid HNO2 HF HCO2H C6H5COOH HO2C2O2CH3COOH NO3 FHCO2 C6H5COOO2C2O2 2CH3COO 4.4 * 10-7 Carbonic acid CO3 2- HCO3 - 1.1 * 10-7 6.3 * 10-8 Hydrosulfuric acid Dihydrogen phosphate ion Hydrogen sulfite ion Hypochlorous acid Hydrocyanic acid Ammonium ion Boric acid H2S H2PO4 - HSHPO4 2- HSHClO HCN NH4 + H3BO3 S2ClOCNNH3 H2BO3 - Hydrogen carbonate ion Hydrogen phosphate ion Dihydrogen borate ion Hydrogen sulfide ion Hydrogen borate ion water HCO3 HPO4 2- CO3 2PO4 3- Perchlorate ion Iodide Bromide Chloride Hydrogen sulfate ion Nitrate ion Water Hydrogen oxalate ion Hydrogen sulfite ion Sulfate ion Dihydrogen phosphate ion Nitrite ion Fluoride ion Methanoate ion Benzoate ion Oxalate ion Ethanoate (acetate) ion Hydrogen carbonate ion Hydrogen sulfide ion Hydrogen phosphate ion Sulfite ion Hypochlorite ion Cyanide ion Ammonia Dihydrogen carbonate ion Carbonate ion Phosphate ion H2BO3HSHBO3 2H 2O HBO3 2S 2BO3 3OH- Hydrogen borate ion Sulfide ion Borate ion Hydroxide 6.2 * 10-8 2.9 * 10-8 6.2 * 10-10 5.8 * 10-10 5.8 * 10-10 4.7 * 10-11 4.2 * 10-13 1.8 * 10-13 1.3 * 10-13 1.6 * 10-14 --------- 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.