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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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:
pH
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: by pH meter
Principles of method if other than guideline:
Measured as negative log of Hydrogen Ion concentration using pH meter & appropriate Buffers of pH 4 & 9
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

pH value
pH value:
2.97
Temp.:
27 °C
Concentration:
1 vol%

Applicant's summary and conclusion

Conclusions:
1% by volume solution of 5-aminonaphthalene-2-sulphonic acid was found to exhibit a pH of 2.97 at 27 deg C. Thus 1% by volume solution of 5-aminonaphthalene-2-sulphonic acid is acidic in nature.
Executive summary:

1% by volume solution of 5-aminonaphthalene-2-sulphonic acid was found to exhibit a pH of 2.97 at 27 deg C. Thus 1% by volume solution of 5-aminonaphthalene-2-sulphonic acid is acidic in nature.