Registration Dossier
Registration Dossier
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EC number: 232-379-5 | CAS number: 8011-76-5 Substance obtained by treating phosphate rock with sulfuric acid or a mixture of sulfuric and phosphoric acids. Composed primarily of calcium phosphates and calcium sulfate.
Dissociation constant
Administrative data
- Endpoint:
- dissociation constant
- Type of information:
- other: handbook
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
Data source
Reference
- Reference Type:
- review article or handbook
- Title:
- Dissociation constants of inorganic substances, 8-44
- Author:
- Lide, D.R. (ed.)
- Year:
- 1 999
- Bibliographic source:
- CRC Handbook of Chemistry and Physics, 80th ed., 1999-2000, New York: CRC Press.
Materials and methods
Test guideline
- Guideline:
- other: not mentioned
- Principles of method if other than guideline:
- Method followed unknown, data taken from handbook
- GLP compliance:
- not specified
Test material
- Reference substance name:
- Calcium(II) ion
- IUPAC Name:
- Calcium(II) ion
- Reference substance name:
- Orthophosphoric acid
- EC Number:
- 231-633-2
- EC Name:
- Orthophosphoric acid
- Cas Number:
- 7664-38-2
- Molecular formula:
- H3O4P
- IUPAC Name:
- phosphoric acid
- Details on test material:
- No additional data available.
Constituent 1
Constituent 2
Results and discussion
- Dissociating properties:
- yes
Dissociation constantopen allclose all
- No.:
- #1
- pKa:
- 12.6
- Temp.:
- 25 °C
- Remarks on result:
- other: Calcium(II) ion
- No.:
- #1
- pKa:
- 2.16
- Temp.:
- 25 °C
- Remarks on result:
- other: phosphoric acid
- No.:
- #2
- pKa:
- 7.21
- Temp.:
- 25 °C
- Remarks on result:
- other: phosphoric acid
- No.:
- #3
- pKa:
- 12.32
- Temp.:
- 25 °C
- Remarks on result:
- other: phosphoric acid
Applicant's summary and conclusion
- Conclusions:
- pKa Calcium (II) ion: 12.6
pKa's phosphoric acid: 2.16, 7.21, 12.32
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