C.I. Acid Yellow 246

Dissociation constant

Link to relevant study record(s)

Reference

Endpoint:

dissociation constant

Type of information:

other: expert judge

Adequacy of study:

key study

Study period:

14 November 1984

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

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:

FAT 20306/B is 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

The test substance is 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 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.