Registration Dossier

Diss Factsheets

Administrative data

Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
1983
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data

Data source

Reference
Reference Type:
publication
Title:
Kirk-Othmer Encyclopedia of Chemical Technology
Author:
John Wiley & Sons, Inc
Year:
1983
Bibliographic source:
Kirk-Othmer Encyclopedia of Chemical Technology

Materials and methods

Principles of method if other than guideline:
Data published
GLP compliance:
not specified

Test material

Constituent 1
Reference substance name:
Sodium diisobutylnaphthalenesulphonate
EC Number:
248-326-4
EC Name:
Sodium diisobutylnaphthalenesulphonate
Cas Number:
27213-90-7
Molecular formula:
Not applicable (UVCB substance)
IUPAC Name:
sodium 2,3-bis(2-methylpropyl)naphthalene-1-sulfonate
Test material form:
solid: particulate/powder

Results and discussion

Dissociating properties:
yes
Dissociation constant
Remarks on result:
other: Sulfonate anions are the conjugate bases of sulfonic acids. Sulfonic acids are such strong acids, that in general they can be considered greater than 99% ionized (pKa values for sulfonic acids is ca. −2.8).

Applicant's summary and conclusion

Conclusions:
The substance is mainly constituted of sodium salts of diisobutyl naphthalene sulfonic acid. Sulfonate anions are the conjugate bases of sulfonic acids, that are very strong acids (pKa ca. -2.8), totally dissociated in water.