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Dissociation constant

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Reference
Endpoint:
dissociation constant
Type of information:
other: expert judge
Adequacy of study:
key study
Study period:
1984.11.14
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: It is sufficient to conclude the dissociation result without further test according to the expert judgement.
Qualifier:
no guideline followed
Principles of method if other than guideline:
Expert Judgement by assesment of chemical structure and functional groups (sulfonic acid moiety) to estimate pKa value.
GLP compliance:
yes
Dissociating properties:
yes
No.:
#1
pKa:
ca. 2
Temp.:
20 °C
Remarks on result:
other: The exact value was not provided.

The sulfonic groups present in the molecule are strong acids. They are therefore almost completely disscociated; pKa-value in the order of magnitude of 2. The exact determination of such a limiting value is not reliable.

Conclusions:
Dissociation constant: almost completely dissociating.
Executive summary:

In an expert statement, it is concluded that the sulfonic groups present in the molecule are strong acids. They are therefore almost completely disscociated; pKa-value in the order of magnitude of 2 is estimated and thus the exact determination of such a limiting value is not reliable.

Description of key information

Dissociation constant: almost completely dissociating.

Key value for chemical safety assessment

pKa at 20°C:
2

Additional information

In an expert statement it is concluded that the sulfonic groups present in the molecule are strong acids. They are therefore almost completely dissociated; pKa-value in the order of magnitude of 2 is estimated in a conservative approach.