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Physical & Chemical properties

pH

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Administrative data

Endpoint:
pH
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study meets generally accepted scientific principles, acceptable for assessment as supporting data

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report Date:
2012

Materials and methods

Principles of method if other than guideline:
pH-measurements (10g/l) taken in the laboratory for solutions of pure test substance with increasing stoichometric amounts of the corresponding base (NaOH).
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Methoxyethylaminebis(methylenephosphonic acid)

- Molecular weight (if other than submission substance): 263.1 g/mol

- Analytical purity: 95.3%

- Lot/batch No.: A2979

- Expiration date of the lot/batch: December 2012

- Stability under test conditions: stable under storage conditions

- Storage condition of test material: in a closed containment at room temperature, protected from humidity and sunlight.

Results and discussion

pH valueopen allclose all
pH value:
2.8
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to MeOEABMP
pH value:
3.8
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to MeOEABMP-1Na
pH value:
5.5
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to MeOEABMP-2Na
pH value:
7.3
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to MeOEABMP-3Na
pH value:
11.1
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to MeOEABMP-4Na

Any other information on results incl. tables

Table 1: Titration in water

Determination 1

Sample mass (mg) 82.82

Equivalent NaOH

0

1

2

3

4

1N NaOH (ml)

0.000

0.301

0.602

0.903

1.204

pH

2.71

4.17

6.00

7.93

11.29

Determination 2

Sample mass (mg) 82.82

Equivalent NaOH

0

1

2

3

4

1N NaOH (ml)

0.000

0.301

0.602

0.903

1.204

pH

2.69

3.91

5.87

7.89

11.27

Average

2.70

4.04

5.94

7.91

11.28

Table 2: Titration in 0.2 M KCl

Determination 1

Sample mass (mg) 82.82

Equivalent NaOH

0

1

2

3

4

1N NaOH (ml)

0.000

0.301

0.602

0.903

1.204

pH

2.77

3.78

5.49

7.29

11.09

Determination 2

Sample mass (mg) 82.82

Equivalent NaOH

0

1

2

3

4

1N NaOH (ml)

0.000

0.301

0.602

0.903

1.204

pH

2.78

3.78

5.51

7.38

11.10

Average

2.78

3.78

5.50

7.34

11.10

Applicant's summary and conclusion

Conclusions:
The pH has been determined using an acceptable scientific method. The result is considered reliable.