Ionization Constants of Weak Acids

Acid Formula a at 25 °C Lewis Structure
acetic CH3CO2H
1.8×10−51.8\times{10}^{-5}
arsenic H3AsO4
5.5×10−35.5\times{10}^{-3}
H2AsO4−
1.7×10−71.7\times{10}^{-7}
HAsO42−
5.1×10−125.1\times{10}^{-12}
arsenous H3AsO3
5.1×10−105.1\times{10}^{-10}
boric H3BO3
5.4×10−105.4\times{10}^{-10}
carbonic H2CO3
4.3×10−74.3\times{10}^{-7}
HCO3−
5.6×10−115.6\times{10}^{-11}
cyanic HCNO
2×10−42\times{10}^{-4}
formic HCO2H
1.8×10−41.8\times{10}^{-4}
hydrazoic HN3
2.5×10−52.5\times{10}^{-5}
hydrocyanic HCN
4.9×10−104.9\times{10}^{-10}
hydrofluoric HF
3.5×10−43.5\times{10}^{-4}
hydrogen peroxide H2O2
2.4×10−122.4\times{10}^{-12}
hydrogen selenide H2Se
1.29×10−41.29\times{10}^{-4}
HSe–
1×10−121\times{10}^{-12}
hydrogen sulfate ion HSO4−
1.2×10−21.2\times{10}^{-2}
hydrogen sulfide H2S
8.9×10−88.9\times{10}^{-8}
HS–
1.0×10−191.0\times{10}^{-19}
hydrogen telluride H2Te
2.3×10−32.3\times{10}^{-3}
HTe–
1.6×10−111.6\times{10}^{-11}
hypobromous HBrO
2.8×10−92.8\times{10}^{-9}
hypochlorous HClO
2.9×10−82.9\times{10}^{-8}
nitrous HNO2
4.6×10−44.6\times{10}^{-4}
oxyalic H2C2O4
6.0×10−26.0\times{10}^{-2}
HC2O4−
6.1×10−56.1\times{10}^{-5}
phosphoric H3PO4
7.5×10−37.5\times{10}^{-3}
H2PO4−
6.2×10−86.2\times{10}^{-8}
HPO42−
4.2×10−134.2\times{10}^{-13}
phosphorous H3PO3
5×10−25\times{10}^{-2}
H2PO3−
2.0×10−72.0\times{10}^{-7}
sulfurous H2SO3
1.6×10−21.6\times{10}^{-2}
HSO3−
6.4×10−86.4\times{10}^{-8}

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