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Physical & Chemical properties

Dissociation constant

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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:
1999
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

Constituent 1
Reference substance name:
Calcium(II) ion
IUPAC Name:
Calcium(II) ion
Constituent 2
Chemical structure
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.

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