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Physical & Chemical properties

pH

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Administrative data

Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
key study
Study period:
13/9/2016 - 13/9/2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: lab data

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report date:
2016

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: OECD 122
Principles of method if other than guideline:
A pH meter is essentially a voltmeter with high input impedance which measures the voltage of an electrode sensitive to the hydrogen ion concentration, relative to another electrode which exhibits a constant voltage
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Trisodium 3-hydroxy-4-(4'-sulphonatonaphthylazo)naphthalene-2,7-disulphonate
EC Number:
213-022-2
EC Name:
Trisodium 3-hydroxy-4-(4'-sulphonatonaphthylazo)naphthalene-2,7-disulphonate
Cas Number:
915-67-3
Molecular formula:
C20H14N2O10S3.3Na
IUPAC Name:
trisodium 3-hydroxy-4-(4'-sulphonatonaphthylazo)naphthalene-2,7-disulphonate
Constituent 2
Reference substance name:
Trisodium 3-hydroxy-4-(4'-sulphonatonaphthylazo) naphthalene-2,7-disulphonate
IUPAC Name:
Trisodium 3-hydroxy-4-(4'-sulphonatonaphthylazo) naphthalene-2,7-disulphonate
Constituent 3
Reference substance name:
Amaranth dye
IUPAC Name:
Amaranth dye
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Details on test material:
Name of test material (as cited in study report): Amaranth dye
Molecular formula (if other than submission substance): C20H11N2Na3O10S3
Molecular weight (if other than submission substance): 604.47
Smiles notation (if other than submission substance): c1ccc2c(c1)c(ccc2S(=O)(=O)[O])N=Nc3c4ccc(cc4cc(c3O)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+].[Na+]
InChl (if other than submission substance): 1S/C20H14N2O10S3.3Na/c23-20-18(35(30,31)32)10-11-9-12(33(24,25)26)5-6-13(11)19(20)22-21-16-7-8-17(34(27,28)29)15-4-2-1-3-14(15)16;;;/h1-10,23H,(H,24,25,26)(H,27,28,29)(H,30,31,32);;;/q;3*+1/p-3
Substance type: Organic
Physical state: Solid

Results and discussion

pH value
pH value:
9.65
Temp.:
28 °C
Concentration:
1 vol%
Remarks on result:
other: basic

Any other information on results incl. tables

TEST RESULTS

Method Details

Observations

Remarks if, any

Guideline

OECD 122

 

 

Method

 

Digital pH meter

 

Principle of method

The pH of an aqueous solution or dispersion in water is determined with a pH measurement interface equipped with an appropriate electrode system.

 

Temperature of 1% w/v test solution

-

28 °C

Mean pH (RESULT)

 

-

9.65

Inference

1.   Acidic

2.   Basic

3.   Neutral

 

Basic

Applicant's summary and conclusion

Conclusions:
The mean pH of 1% w/v aqueous solution of the test item Trisodium 3-hydroxy-4-(4'-sulphonatonaphthylazo) naphthalene-2,7-disulphonate (CAS No. 915-67-3) was 9.65 at 28 °C.
Executive summary:

The pH determination of test item Trisodium 3-hydroxy-4-(4'-sulphonatonaphthylazo) naphthalene-2,7-disulphonate (CAS No.915-67-3) was done following OECD guideline 122. Mean pH of 1% w/v aqueous solution was measured with the help of pH meter and it was observed to be 9.65 at 28 °C.

The test chemical was concluded to be basic in nature.