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Appendix H  Ionization Constants of Weak Acids

 

Table H1  Ionization Constants of Weak Acids

Acid

Formula

Ka at 25°C

Lewis Structure

acetic

CH3CO2H

1.8 × 10−5

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arsenic

H3AsO4

5.5 × 10−3

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H2AsO4–

1.7 × 10−7
HAsO42–

3.0 × 10−12

arsenous

H3AsO3

5.1 × 10−10

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boric

H3BO3

5.4 × 10−10

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carbonic

H2CO3

4.3 × 10−7

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HCO3–

4.7 × 10−11

cyanic

HCNO

2 × 10−4

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formic

HCO2H

1.8 × 10−4

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hydrazoic

HN3

2.5 × 10−5

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hydrocyanic

HCN

4.9 × 10−10

hydrofluoric

HF

6.4 × 10−4

hydrogen peroxide

H2O2

2.4 × 10−12

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hydrogen selenide

H2Se

1.29 × 10−4

HSe–

1 × 10−12

hydrogen sulfate ion

HSO4–

1.2 × 10−2

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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

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oxalic

H2C2O4

6.0 × 10−2

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HC2O4–

6.1 × 10−5

phosphoric

H3PO4

7.5 × 10−3

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H2PO4–

6.2 × 10−8

HPO42–

4.2 × 10−13

phosphorous

H3PO3

5 × 10−2

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H2PO3–

2.0 × 10−7

sulfurous

H2SO3

1.6 × 10−2

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HSO3–

6.4 × 10−8

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Appendix H Ionization Constants of Weak Acids Copyright © by Nicole Bouvier-Brown; Saori Shiraki; J. Ryan Hunt; and Emily Jarvis is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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