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Physical & Chemical properties

Dissociation constant

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Reference
Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Basic data given (comparable to guidelines/standards)
Qualifier:
no guideline followed
Principles of method if other than guideline:
Titration method
GLP compliance:
not specified
Dissociating properties:
yes
pKa:
9.03
Temp.:
25 °C
Remarks on result:
other: conc. 0.1 N

Data used in pKa calculations (AEPD-85, 0.384 g/250 mL):

mL 0.2000 N HCl

pH

temp. (°C)

0.0

10.55

25.0

1.0

10.18

25.1

2.0

9.86

25.1

3.0

9.62

25.1

4.0

9.44

25.1

5.0

9.28

25.1

6.0

9.12

25.1

7.0

8.98

25.1

8.0

8.83

25.1

9.0

8.69

25.1

10.0

8.52

25.1

11.0

8.32

25.1

12.0

8.02

25.1

In addition, it is reported that a QSAR model has been developed for alkanoamines. The result for AEPD (9.08) confirms the experimental determination.

Description of key information

pKa = 9.03 at 25 °C

Key value for chemical safety assessment

Additional information

Titration method (no guideline named).