pKa₁

pKa₂

pKa₃

Temp. (K)

Ionic medium

Method

Ref

2,3-

2.41

10.30

13.48

N/A

DHBA

2.74

9.91

-

298

0.1 M NaClO₄

Potentiometry

[7]

-

10.16

-

298

0.1 M NaClO₄

Spectroscopy

[7]

3.32

9.87

>14

298

0.2 M KCl

Potentiometry

[1]

3,4-

4.22

8.65

-

298

0.6 M NaCl

Potentiometry

[8]

DHBA

4.28

8.70

13.0

298

0.2 M KCl

Potentiometry

[1]

4.26

8.66

-

298

0.1 M NaClO₄

Potentiometry

[7]

-

9.06

-

298

0.1 M NaClO₄

Spectroscopy

[7]

4.48

8.83

12.6

298

N/A