E1: Acid Dissociation Constants at 25°C

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Name	Formula	K _a1	pK_a1	K _a2	pK_a2	K _a3	pK_a3	K _a4	pK_a4
Acetic acid	CH₃CO₂H	1.75 × 10⁻⁵	4.756	-	-	-	-	-	-
Arsenic acid	H₃AsO₄	5.5 × 10⁻³	2.26	1.7 × 10⁻⁷	6.76	5.1 × 10⁻¹²	11.29	-	-
Benzoic acid	C₆H₅CO₂H	6.25 × 10⁻⁵	4.204	-	-	-	-	-	-
Boric acid	H₃BO₃	5.4 × 10⁻¹⁰*	9.27*	>1 × 10⁻¹⁴*	>14*	-	-	-	-
Bromoacetic acid	CH₂BrCO₂H	1.3 × 10⁻³	2.90	-	-	-	-	-	-
Carbonic acid	H₂CO₃	4.5 × 10⁻⁷	6.35	4.7 × 10⁻¹¹	10.33	-	-	-	-
Chloroacetic acid	CH₂ClCO₂H	1.3 × 10⁻³	2.87	-	-	-	-	-	-
Chlorous acid	HClO₂	1.1 × 10⁻²	1.94	-	-	-	-	-	-
Chromic acid	H₂CrO₄	1.8 × 10⁻¹	0.74	3.2 × 10⁻⁷	6.49	-	-	-	-
Citric acid	C₆H₈O₇	7.4 × 10⁻⁴	3.13	1.7 × 10⁻⁵	4.76	4.0 × 10⁻⁷	6.40	-	-
Cyanic acid	HCNO	3.5 × 10⁻⁴	3.46	-	-	-	-	-	-
Dichloroacetic acid	CHCl₂CO₂H	4.5 × 10⁻²	1.35	-	-	-	-	-	-
Fluoroacetic acid	CH₂FCO₂H	2.6 × 10⁻³	2.59	-	-	-	-	-	-
Formic acid	CH₂O₂	1.8 × 10⁻⁴	3.75	-	-	-	-	-	-
Hydrazoic acid	HN₃	2.5 × 10⁻⁵	4.6	-	-	-	-	-	-
Hydrocyanic acid	HCN	6.2 × 10⁻¹⁰	9.21	-	-	-	-	-	-
Hydrofluoric acid	HF	6.3 × 10⁻⁴	3.20	-	-	-	-	-	-
Hydrogen peroxide	HOOH	2.0 × 10⁻¹²	11.7
Hydrogen selenide	H₂Se	1.3 × 10⁻⁴	3.89	1.0× 10⁻¹¹	11.0	-	-	-	-
Hydrogen sulfide	H₂S	8.9 × 10⁻⁸	7.05	1 × 10⁻¹⁹	19	-	-	-	-
Hydrogen telluride	H₂Te	2.5 × 10^−3‡	2.6^‡	1 × 10⁻¹¹	11	-	-	-	-
Hypobromous acid	HBrO	2.8 × 10⁻⁹	8.55	-	-	-	-	-	-
Hypochlorous acid	HClO	4.0 × 10⁻⁸	7.40	-	-	-	-	-	-
Hypoiodous acid	HIO	3.2 × 10⁻¹¹	10.5	-	-	-	-	-	-
Iodic acid	HIO₃	1.7 × 10⁻¹	0.78	-	-	-	-	-	-
Iodoacetic acid	CH₂ICO₂H	6.6 × 10⁻⁴	3.18	-	-	-	-	-	-
Nitrous acid	HNO₂	5.6 × 10⁻⁴	3.25	-	-	-	-	-	-
Oxalic acid	C₂H₂O₄	5.6 × 10⁻²	1.25	1.5 × 10⁻⁴	3.81	-	-	-	-
Periodic acid	HIO₄	2.3 × 10⁻²	1.64	-	-	-	-	-	-
Phenol	C₆H₅OH	1.0 × 10⁻¹⁰	9.99	-	-	-	-	-	-
Phosphoric acid	H₃PO₄	6.9 × 10⁻³	2.16	6.2 × 10⁻⁸	7.21	4.8 × 10⁻¹³	12.32	-	-
Phosphorous acid	H₃PO₃	5.0 × 10⁻²*	1.3*	2.0 × 10⁻⁷*	6.70*	-	-	-	-
Pyrophosphoric acid	H₄P₂O₇	1.2 × 10⁻¹	0.91	7.9 × 10⁻³	2.10	2.0 × 10⁻⁷	6.70	4.8 × 10⁻¹⁰	9.32
Resorcinol	C₆H₄(OH)₂	4.8 × 10⁻¹⁰	9.32	7.9 × 10⁻¹²	11.1	-	-	-	-
Selenic acid	H₂SeO₄	Strong	Strong	2.0 × 10⁻²	1.7	-	-	-	-
Selenious acid	H₂SeO₃	2.4 × 10⁻³	2.62	4.8 × 10⁻⁹	8.32	-	-	-	-
Sulfuric acid	H₂SO₄	Strong	Strong	1.0 × 10⁻²	1.99	-	-	-	-
Sulfurous acid	H₂SO₃	1.4 × 10⁻²	1.85	6.3 × 10⁻⁸	7.2	-	-	-	-
meso-Tartaric acid	C₄H₆O₆	6.8 × 10⁻⁴	3.17	1.2 × 10⁻⁵	4.91	-	-	-	-
Telluric acid	H₂TeO₄	2.1 × 10^−8‡	7.68^‡	1.0 × 10^−11‡	11.0^‡	-	-	-	-
Tellurous acid	H₂TeO₃	5.4 × 10⁻⁷	6.27	3.7 × 10⁻⁹	8.43	-	-	-	-
Trichloroacetic acid	CCl₃CO₂H	2.2 × 10⁻¹	0.66	-	-	-	-	-	-
Trifluoroacetic acid	CF₃CO₂H	3.0 × 10⁻¹	0.52	-	-	-	-	-	-
* Measured at 20°C, not 25°C.
‡ Measured at 18°C, not 25°C.

Source of data: CRC Handbook of Chemistry and Physics, 84th Edition (2004).

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