pka/pkb/ pH values

pH in stomach

1

pH in duodenum

5

pH in lower ileum

8

pH of circulating fluids (cerebrospinal fluid, plasma)

7.4

pKa of imidazole

7

pkB of imidazole

7

pKa of oxazole

1

pKb of oxazole

13

pKa of thiazole

3

pKb of thiazole

11

pKa of isoxazole

9

pKb of isoxazole

5

pKb of sodium hydroxide (NaOH)

0.2

pKb of piperdine (C5H10NH or (CH2)5NH)

2.9

pKb of Imidazole (C3H4N2)

7.5

pKb of pyridine (C5H5N)

8.7

pKb of Aniline (C6H5NH2)

9.4

pKb of Triethylamine (Et3NH)

3.3

pKb of Diethylamine (Et2NH)

3.4

pKb of ammonia (NH3)

4.8

pKa of p-MeOC6H4OH

10.2

pKa of p-NO2C6H4OH

7.1

pKa of p-MeOC6H4CO2H

4.5

pKa of 4-chlorobenzoic acid (p-ClC6H4CO2H)

4.0

pKa of m-NO2C6H4OH

8.4

pKa of 3-chlorobenzoic acid (m-ClC6H4CO2H)

3.8

pKa of C6H5OH

9.8

pKa of 2-chlorobenzoic acid (o-ClC6H4CO2H)

2.9

(Cyclohexl)3COH

24.0

pKa of benzoic acid (C6H5CO2H)

4.2

pKa of tert-butyl alcohol (t-BuOH)

17.0

pKa of Trifluoroacetic acid (CF3CO2H)

-0.3

pKa of Isopropyl alcohol (iPrOH)

16.5

pKa of Fluroacetic acid

2.7

pKa of methanol (MeOH or H3C-OH)

15.5

pKa of Acetic Acid (Carboxylic Acid) (CH3CO2H)

4.8

pKa of methansulfonic Acid (CH3SO3H)

-2.6

pKa of Formic Acid (HCO2H)

3.8

pKa of acrylic acid (CH2CHO2H)

4.3