PKa data

From OChemOnline
Jump to: navigation, search

The following table gives approximate values of pKa in water for common functional groups. The figure given is for the bolded hydrogen.

Name Formula Approximate pKa
Trifluoromethanesulfonic acid CF3SO3H -14
Hydriodic acid HI -10
Hydrobromic acid HBr -9
Hydrochloric acid HCl -7
Oxonium ion RO+HR' -3.5
Sulfuric acid H2SO4 -3 / 2
Methanesulfonic acid CH3SO3H -2.6
Hydronium ion H3O+ -1.74
Nitric acid HNO3 -1.3
Trifluoroacetic acid CF3COOH -0.3
Phosphoric acid H3PO4 2.1 / 7.2 / 12.3
Hydrofluoric acid HF 3.17
Carboxylic acid RCOOH 4-5
Carbonic acid H2CO3 6.35
Hydrogen sulfide H2S 7
Peroxyacid RCOOOH 8
Phenol ArOH 8-11
β-diketone RCOCH2COR' 9
Hydrogen cyanide HCN 9.2
Ammonium ion NH4+ 9.24
Alkylammonium ion RNH3+ 10-11
Thiol RSH 10-11
Bicarbonate HCO3- 10.33
β-ketoester RCOCH2COOR' 11
Peroxide ROOH 11.5
β-diester ROOCCH2COOR' 13
Methanol CH3OH 15.2
Water H2O 15.7
Alcohol ROH 16-18
Aldehyde RCH2CHO 16
Amide RCONH2 17
Ketone RCH2COR' 18-20
Ester RCH2COOR' 23-25
Amide RCH2CONR'R 23-25
Nitrile RCH2CN 25
Alkyne RCΞCH 25
Hydrogen H2 35
Ammonia NH3 38
Amine RNH2 40
Alkene CH2=CH2 44
Methane CH4 48
Alkane C2H6 50
Personal tools
Namespaces

Variants
Actions
Navigation
Categories
Tools