Ionization Constants of Weak Acids

Acid Formula a at 25 °C Lewis Structure
acetic CH3CO2H
1.8×1051.8\times{10}^{-5}
arsenic H3AsO4
5.5×1035.5\times{10}^{-3}
H2AsO4
1.7×1071.7\times{10}^{-7}
HAsO42−
5.1×10125.1\times{10}^{-12}
arsenous H3AsO3
5.1×10105.1\times{10}^{-10}
boric H3BO3
5.4×10105.4\times{10}^{-10}
carbonic H2CO3
4.3×1074.3\times{10}^{-7}
HCO3
5.6×10115.6\times{10}^{-11}
cyanic HCNO
2×1042\times{10}^{-4}
formic HCO2H
1.8×1041.8\times{10}^{-4}
hydrazoic HN3
2.5×1052.5\times{10}^{-5}
hydrocyanic HCN
4.9×10104.9\times{10}^{-10}
hydrofluoric HF
3.5×1043.5\times{10}^{-4}
hydrogen peroxide H2O2
2.4×10122.4\times{10}^{-12}
hydrogen selenide H2Se
1.29×1041.29\times{10}^{-4}
HSe
1×10121\times{10}^{-12}
hydrogen sulfate ion HSO4
1.2×1021.2\times{10}^{-2}
hydrogen sulfide H2S
8.9×1088.9\times{10}^{-8}
HS
1.0×10191.0\times{10}^{-19}
hydrogen telluride H2Te
2.3×1032.3\times{10}^{-3}
HTe
1.6×10111.6\times{10}^{-11}
hypobromous HBrO
2.8×1092.8\times{10}^{-9}
hypochlorous HClO
2.9×1082.9\times{10}^{-8}
nitrous HNO2
4.6×1044.6\times{10}^{-4}
oxyalic H2C2O4
6.0×1026.0\times{10}^{-2}
HC2O4
6.1×1056.1\times{10}^{-5}
phosphoric H3PO4
7.5×1037.5\times{10}^{-3}
H2PO4
6.2×1086.2\times{10}^{-8}
HPO42−
4.2×10134.2\times{10}^{-13}
phosphorous H3PO3
5×1025\times{10}^{-2}
H2PO3
2.0×1072.0\times{10}^{-7}
sulfurous H2SO3
1.6×1021.6\times{10}^{-2}
HSO3
6.4×1086.4\times{10}^{-8}

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