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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24.04.2013 - 10.05.2013
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other:
Principles of method if other than guideline:
Measurement of capacity of a compound to dissociate into respective ions.
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
5-aminonaphthalene-2-sulphonic acid
EC Number:
204-351-2
EC Name:
5-aminonaphthalene-2-sulphonic acid
Cas Number:
119-79-9
Molecular formula:
C10H9NO3S
IUPAC Name:
5-aminonaphthalene-2-sulfonic acid
Test material form:
other: Amorphous
Details on test material:
- Name of test material: 5-aminonaphthalene-2-sulphonic acid
- Substance type: Organic
- Physical state: solid

Results and discussion

Dissociating properties:
yes
Dissociation constantopen allclose all
No.:
#1
pKa:
0
Temp.:
39 °C
Remarks on result:
other: 0.2606 x 10-8 = 0.000000002606
No.:
#2
pKa:
0
Temp.:
39 °C
Remarks on result:
other: 0.2606 x 10-8 = 0.000000002606
No.:
#3
pKa:
0
Temp.:
39 °C
Remarks on result:
other: 0.2607 x 10-8 = 0.000000002607

Applicant's summary and conclusion

Conclusions:
The experimental pKa value for 5-aminonaphthalene-2-sulphonic acid was found to be 0.0000000026063333 (average pKa value) at 39deg C indicating that the chemical has dissociation properties.
Executive summary:

The experimental pKa value for 5-aminonaphthalene-2-sulphonic acid was found to be 0.0000000026063333 (average pKa value) at 39deg C indicating that the chemical has dissociation properties.