PKa Vaules For Organic And Inorganic Bronsted Acids At 25o Ca

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pKa Values for Organic and InorganicBronsted Acids at 25 oC

Acid strengths decrease down the tablea. Conjugate base strengths increase down the tableb.

Name Acid / Conjugate base pKa
Sulfuric acid -10
Hydrogen iodide -10
Hydrogen bromide -9
Hydrogen chloride -7
Acetone conjugate acid -7
Benzenesulfonic acid -6.5
Acetic acid conjugate acid -6
Diethyl ether conjugate acid -3.5
Ethanol conjugate acid -2
Methanesulfonic acid -2
Hydronium ion -1.74
Nitric acid -1.5
Trifluoroacetic acid 0.5
Bisulfate ion 2.0
Benzoic acid 4.2
Anilinium ion 4.6
Acetic acid 4.8
Pyridinium ion 5.2
Carbonic acid 6.4
Thiophenol 6.6
Hydrogen sulfide 7.0
Peracetic acid 8.2
Phthalimide 8.3
Nitroethane 8.5
Pentane-2,4-dione 9.0
Ammonium ion 9.3
Hydrogen cyanide 9.3
Hexaflurorisopropanol 9.3
Phenol 9.9
Bicarbonate ion 10.3
Methanethiol 10.3
Ethylammonium ion 10.8
Diethyl malonate 12.9
Guanidinium ion 13.6
Cyclopentadiene 15.0
Water 15.74
Ethanol 16.0
Cyclohexanone 16.7
Acetamide 17
Isopropanol 17.1
t-Butanol 18.0
Acetone 19.3
Ethyl acetate 25
Ethyne 25
Acetonitrile 25
Dimethylsulfone 28
Diemthylsulfoxide 35
Ammonia 36
Diisopropylamine 40
Toluene 41
Benzene 43
Propene 43
Ethene 44
Methane approx. 60
  1. For strengths of organic acids see E. P. Serjeant and B. Dempsey (eds.), Ionization Constants of Organic Acids in Solution, IUPAC Chemical Data Series No. 23, Pergamon Press, Oxford, UK, 1979.
  2. The strength of a base is related to the pKa of its conjugate acid as pKb = 14 - pKa.

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