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0.8 Ionization constants of weak acids

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Ionization Constants of Weak Acids
Acid Formula K a at 25 °C Lewis Structure
acetic CH 3 CO 2 H 1.8 × 10 −5
arsenic H 3 AsO 4 5.5 × 10 −3
1.7 × 10 −7
5.1 × 10 −12
arsenous H 3 AsO 3 5.1 × 10 −10
boric H 3 BO 3 5.4 × 10 −10
carbonic H 2 CO 3 4.3 × 10 −7
5.6 × 10 −11
cyanic H CNO 2 × 10 −4
formic HCO 2 H 1.8 × 10 −4
hydrazoic H N 3 2.5 × 10 −5
hydrocyanic H CN 4.9 × 10 −10
hydrofluoric H F 3.5 × 10 −4
hydrogen peroxide H 2 O 2 2.4 × 10 −12
hydrogen selenide H 2 Se 1.29 × 10 −4
H Se – 1 × 10 −12
hydrogen sulfate ion 1.2 × 10 −2
hydrogen sulfide H 2 S 8.9 × 10 −8
H S – 1.0 × 10 −19
hydrogen telluride H 2 Te 2.3 × 10 −3
H Te – 1.6 × 10 −11
hypobromous H BrO 2.8 × 10 −9
hypochlorous H ClO 2.9 × 10 −8
nitrous H NO 2 4.6 × 10 −4
oxalic H 2 C 2 O 4 6.0 × 10 −2
6.1 × 10 −5
phosphoric H 3 PO 4 7.5 × 10 −3
6.2 × 10 −8
4.2 × 10 −13
phosphorous H 3 PO 3 5 × 10 −2
2.0 × 10 −7
sulfurous H 2 SO 3 1.6 × 10 −2
6.4 × 10 −8
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Source:  OpenStax, Chemistry. OpenStax CNX. May 20, 2015 Download for free at http://legacy.cnx.org/content/col11760/1.9
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