Common pKA Values

Hydrogen Iodide (HI)

-10

Hydrogen Bromide (HBr)

-9

Sulfuric acid (H₂SO₄)

-3

Hydrogen Chloride (HCl)

-8

Hydronium (H₃O⁺)

-1.7

Nitric Acid (HNO3)

-1.3

Hydrogen Fluoride (HF)

3.2

Acetic Acid (CH₃COOH)

4.76

Carbonic Acid (H₂CO₃)

6.4

Thiols (general)`

~7

Hydrogen Sulfide (H₂S)

7.0

Ammonium (NH₄⁺)

9.3

Phenol (C₆H₅OH)

10

Hydrogen Carbonate (HCO₃^-)

10.2

Methanol (CH₃OH)

15.2

Water (H₂O)

15.7

Ethanol (CH₃CH₂OH)

16

Isopropyl alcohol ((CH₃)₂CHOH)

17

tert-Butyl alcohol ((CH₃)₃COH)

18

Acetone (CH₃COCH₃)

19

Acetylene/Ethyne (HC≡CH)

24-26

Hydrogen (H₂)

35

Ammonia (NH₃)

36/38

Benzene

43

Ethylene/Ethene (H₂C=CH₂)

50

Methane (CH₄)

50-60

Ethane (C₂H₆)

62

Hydrogen sulfate (HSO₄^-)

2.0

Anilinium (C₆H₅NH₃)

4.6

Methanethiol (CH₃SH)

10.7

Dimethylammonium ion ((CH₃)₂NH₂⁺)

10.7

Disopropylamine

36

Alcohols (general)

15-19

Carboxylic acids (general)

2-5

Triethyl amine

10.75

Hexanes

51

Cyclobutane

60