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Physical & Chemical properties

pH

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Administrative data

Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
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, HMDTMP with increasing stoichometric amounts of the corresponding base (NaOH).
GLP compliance:
not specified

Test material

Constituent 1
Reference substance name:
[hexane-1,6-diylbis[nitrilobis(methylene)]]tetrakisphosphonic acid, sodium salt
EC Number:
260-362-2
EC Name:
[hexane-1,6-diylbis[nitrilobis(methylene)]]tetrakisphosphonic acid, sodium salt
Cas Number:
56744-47-9
Molecular formula:
C10H28N2O12P4.xNa

Results and discussion

pH valueopen allclose all
pH value:
2.7
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP
pH value:
3.1
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-1
pH value:
3.9
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-2
pH value:
4.9
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-3
pH value:
5.7
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-4
pH value:
6.5
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-5
pH value:
8.7
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-6
pH value:
10.9
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-7
pH value:
11.3
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-8

Any other information on results incl. tables

Table 1: Titration in water

Determination 1

Sample mass (mg) 76.43

Equivalent NaOH

0

1

2

3

4

5

6

7

8

1N NaOH (ml)

0.000

0.150

0.301

0.451

0.601

0.752

0.902

1.052

1.203

pH

2.68

3.00

4.10

5.40

6.30

7.17

9.29

10.98

11.29

 

Determination 2

Sample mass (mg) 76.43

Equivalent NaOH

0

1

2

3

4

5

6

7

8

1N NaOH (ml)

0.000

0.150

0.301

0.451

0.601

0.752

0.902

1.052

1.203

pH

2.68

3.00

4.11

5.41

6.30

7.17

9.30

10.99

11.29

Average

2.68

3.00

4.11

5.41

6.30

7.17

9.30

10.99

11.29

 

 

Table 2: Titration in 0.2 M KCl

Determination 1

Sample mass (mg) 76.43

 

 

Equivalent NaOH

0

1

2

3

4

5

6

7

8

1N NaOH (ml)

0.000

0.150

0.301

0.451

0.601

0.752

0.902

1.052

1.203

pH

2.73

3.05

3.88

4.91

5.69

6.46

8.71

10.92

11.24

 

Determination 2

Sample mass (mg) 99.06              

Equivalent NaOH

0

1

2

3

4

5

6

7

 

1N NaOH (ml)

0.000

0.150

0.301

0.451

0.601

0.752

0.902

1.052

1.203

pH

2.72

3.04

3.87

4.91

5.69

6.46

8.74

10.93

11.25

Average

2.73

3.05

3.88

4.91

5.69

6.46

8.73

10.93

11.25

 

 

Applicant's summary and conclusion

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