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Appendix H: Ionization Constants of Weak Acids

Appendix H: Ionization Constants of Weak Acids

Ionization Constants of Weak Acids
Acid Formula Ka at 25 °C Lewis Structure
acetic CH3CO2H 1.8 × 10−5
arsenic H3AsO4 5.5 × 10−3
1.7 × 10−7
3.0 × 10−12
arsenous H3AsO3 5.1 × 10−10
boric H3BO3 5.4 × 10−10
carbonic H2CO3 4.3 × 10−7
4.7 × 10−11
cyanic HCNO 2 × 10−4
formic HCO2H 1.8 × 10−4
hydrazoic HN3 2.5 × 10−5
hydrocyanic HCN 4.9 × 10−10
hydrofluoric HF 6.4 × 10−4
hydrogen peroxide H2O2 2.4 × 10−12
hydrogen selenide H2Se 1.29 × 10−4
HSe– 1 × 10−12
hydrogen sulfate ion 1.2 × 10−2
hydrogen sulfide H2S 8.9 × 10−8
HS– 1.0 × 10−19
hydrogen telluride H2Te 2.3 × 10−3
HTe– 1.6 × 10−11
hypobromous HBrO 2.8 × 10−9
hypochlorous HClO 2.9 × 10−8
nitrous HNO2 4.6 × 10−4
oxalic H2C2O4 6.0 × 10−2
6.1 × 10−5
phosphoric H3PO4 7.5 × 10−3
6.2 × 10−8
4.2 × 10−13
phosphorous H3PO3 5 × 10−2
2.0 × 10−7
sulfurous H2SO3 1.6 × 10−2
6.4 × 10−8

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