Table of Acids with K and pK values at 25%
Acid
HA
pK, Acid Strength Conjugate Base Strength
Hydroiodic HI I- Perchloric HClO4 ClO4- Hydrobromic HBr Br- Hydrochloric HCl Cl- Chloric HClO3 ClO3- Sulfuric (1) H2SO4 HSO4- Nitric HNO2 NO2- Hydronium H3O+ H2O Iodic HIO2 IO2- Oxalic (1) H2C2O4 HC2O4- Sulfurous H2SO3 HSO3- Chlorous HClO2 ClO2- Phosphoric H3PO4 H2PO4- Chloroacetic CH2ClCOOH CH2ClCOO- Citric H3C6H5O7 HC6H5O7- Hydrofluoric HF F- Nitrous HNO2 NO2- Formic HCOOH HCOO- Lactic H3C3H5O3 C3H5O3- Ascorbic H3C6H7O6 C6H7O6- Benzoic C6H5COOH C6H5COO- Oxalic H2C2O4 C2O4-2 Hydrazoic HN3 N3- Citric H3C6H5O7 C6H5O7- Acetic CH3COOH CH3COO- Propionic CH3CH2COOH CH3CH2COO- Pyridinium ion C5H5NH+ C5H5N Citric H3C6H5O7 C6H5O7- Carbonic H2CO3 HCO3- Sulfurous H2SO3 SO3-2 Phosphoric H3PO4 HPO4-2 Hypobromous HBrO BrO- Hydrocyanic HCN CN- Boric H3BO3 H2BO3- Ammonium ion NH4+ NH3 Phenol C6H5OH C6H5O- Carbonic H2CO3 CO3-2 Hypoiodous HIO HI- Hydrogen peroxide H2O2 HO2- Ascorbic H3C6H5O6 C6H5O6- Phosphoric (3) H3PO4 PO4-3 Later HO- Methanol CH3OH CH3O- Ammonia NH3 NH2- Group metal hydroxides (LiOH, NaOH, etc.) Group II metal hydroxides (Mg(OH)2, Ba(OH)2, etc.)
Strong acids (K > 1, pK < 1)
1.6x10^-5 5.9x10^-4 1.54x10^-2 12x10^2 1x10^7 2.52x10^-5 14x10^4 8.4x10^-4 7.2x10^-4 4.0x10^-4 1.72x10^-4 1.38x10^-4 2.9x10^-6 6.46x10^-5 6.4x10^-4 19x10^-5 1.8x10^-5 1.76x10^-4 1.34x10^-4 5.6x10^-5 2x10^-4 43x10^-7 1.02x10^-7 6.23x10^-8 2x10^-9 6.17x10^-10 5.8x10^-10 5.6x10^-10 1.6x10^-10 48x10^-2 2x10^-5 24x10^-12 1.6x10^-42 48x10^-1 1x10^-18 1x10^-34
0.80 1.23 1.81 1.92 1.96 2.12 2.85 3.08 3.14 3.39 3.75 3.86 4.10 4.19 4.19 4.72 4.74 4.75 4.87 5.25 5.40 6.37 6.91 7.21 8.70 9.21 9.23 9.25 9.80 10.32 10.70 11.62 11.80 12.32 14.0 18.0 34.0
Strong Bases (Kb > 1, pKs < 1)