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Physical & Chemical properties

pH

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Administrative data

Endpoint:
pH
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
For justification of read-across see endpoint summary
Cross-reference
Reason / purpose:
read-across source
Reference
Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study meets generally accepted scientific principles, acceptable for assessment as supporting data
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
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-1Na
pH value:
3.9
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-2Na
pH value:
4.9
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-3Na
pH value:
5.7
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-4Na
pH value:
6.5
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-5Na
pH value:
8.7
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-6Na
pH value:
10.9
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-7Na
pH value:
11.3
Temp.:
20 °C
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HMDTMP-8Na

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

 

 

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

Data source

Materials and methods

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
not specified

Results and discussion

Applicant's summary and conclusion