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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
experimental test results performed using standard guidelines

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2022
Report date:
2022

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 122 (Determination of pH, Acidity and Alkalinity)
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Benzenesulfonic acid, 2,4-diamino-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-5-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4
Cas Number:
607724-40-3
Molecular formula:
C22H24N6O18S6.Na4
IUPAC Name:
Benzenesulfonic acid, 2,4-diamino-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-5-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4
Test material form:
solid: particulate/powder
Details on test material:
Name - Benzenesulfonic acid, 2,4-diamino-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-5-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4)
Common name- Reactive orange 131
Molecular formula - C22H24N6O18S6.Na4
Molecular weight - 944.8 g/mol
Smiles- C1=CC(=CC=C1N=NC2=C(C(=CC(=C2N)S(=O)(=O)[O-])N=NC3=C(C=C(C=C3)S(=O)(=O)CCOS(=O)(=O)[O-])S(=O)(=O)[O-])N)S(=O)(=O)CCOS(=O)(=O)[O-].[Na+].[Na+].[Na+].[Na+]
InchI – InChI=1S/C22H24N6O18S6.4Na/c23-20-17(27-26-16-6-5-15(11-18(16)49(33,34)35)48(31,32)10-8-46-52(42,43)44)12-19(50(36,37)38)21(24)22(20)28-25-13-1-3-14(4-2-13)47(29,30)9-7-45-51(39,40)41;;;;/h1-6,11-12H,7-10,23-24H2,(H,33,34,35)(H,36,37,38)(H,39,40,41)(H,42,43,44);;;;/q;4*+1/p-4
IchIkey – AGIHRCNCAVHEJO-UHFFFAOYSA-J
Substance type - Organic solid

Results and discussion

pH value
Key result
pH value:
4.76
Temp.:
244 °C
Concentration:
1 vol%

Any other information on results incl. tables

OBSERVATIONS

The pH value of 1% aqueous solution are recorded after  two minutes, (and 10 minutes if required) at 24.4°C .


























Method Details

Observations 



Remarks if, any



Temperature of 1% w/v test solution


 24.4

 



pH value after 2nd minute


 4.76

Inference




  1. Acidic

  2. Basic

  3. Neutral


 



Acidic



Applicant's summary and conclusion

Conclusions:
The experimental pH value for 1% aqueous solution of test chemical  was determined to be 4.76 at 24.4°C ,inferring its  acidic nature.
Executive summary:

A study was performed to determine the pH of test chemical at respective temperature.



The study was conducted in accordance with OECD 122, Guideline for testing of chemicals, for pH Adopted by Council on 26th July, 2013.


pH value for 1% aqueous solution of test chemical was determined to be 4.76 at 24.4 °C ,inferring its  acidic nature.