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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

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
2010
Report date:
2010

Materials and methods

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

Test material

Constituent 1
Chemical structure
Reference substance name:
Etidronic acid
EC Number:
220-552-8
EC Name:
Etidronic acid
Cas Number:
2809-21-4
Molecular formula:
C2H8O7P2
IUPAC Name:
(1-hydroxyethylidene)bisphosphonic acid
Test material form:
solid: crystalline

Results and discussion

pH valueopen allclose all
pH value:
2.5
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HEDP-1Na
pH value:
4.6
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HEDP-2Na
pH value:
10.4
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HEDP-3Na
pH value:
11.7
Concentration:
10 g/L
Remarks on result:
other: Stoichiometric loading of base equivalent to HEDP-4Na

Applicant's summary and conclusion

Conclusions:
pH values of 2.5, 4.6, 10.4 and 11.7 were determined for the substance using a relevant method.