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Solubility of Ca5{P04)3OH in the System Ca{OH)2-H3P04-H20 at 5, 15, 25, and 37 °C
Open accessAbstract
Solubility isothe nns of hydroxyapatite, Ca5(PO.hOH (OHAp) , pre pa red by titrating a boiling aqueous suspe nsion of Ca(O HJ, with 0 .5 M H3PO., we re detennined in the te rnary system Ca(OHJ,-H3PO.-H20at 5, 15, 25, a nd 3 7 °C in the pH ra nge 3 .7-6.7 by equilibration with dilute H3PO.solutio ns.The solubility product K" dete rmi ned as a fun ct io n of te mpe rature by a gene ra lized least-squa res procedure from 4 1 ex pe rimenta l points, is g ive n by the equation log K, = -82 19.41/ l' -1.6657 -0.0982 151'.The values of K s and it s dis persion at 25 a nd 37°C a re 3.04 (0.25) a nd 2.35 (0.27) X 10-59 .The re is a max imum in K s near 16°C, whic h may be d ue to the fo rm of te mperature de pendence found earlier fo r the sta bilit y constants of the ion pa irs Ca H2POt a nd Ca HPO~.The re lati ve pos itio ns of the isothe rms s how that OHA p has a negati ve the rma l coeffi cient of solub ility.T hermod ynam ic fun ctions for the di sso lutio n of the sa lt a re report ed .T he so lubility data previous ly re pOl1ed by others fo r OHAp at 25°C were rev iewed .The solubility prod uc ts obta ined by three of these in vestigators were compara ble with our value of 3 .0X 10-59 ; thei r data were reeva luated by the method desc ri bed he re.We conclude that the best value fo r the so lubility p rod uct at 25 °c is 4.7 (2 .0)X 10-59 .
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Cited by
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Metadata
- Authors
- McDowell, H., Gregory, T. M., & Brown, W. E.
- Venue
- Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Published
- 1977-04
- Volume
- 81A
- Issue
- 1
- Pages
- 273
- ISSN
- 0022-4332 (ISSN-L)
- OpenAlex
- W4255422141
- Cited by
- 382
- References
- 0
- FWCI
- 0.78
- Type
- journal article
- Language
- en
- Open access
- diamond
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- CoChat. (2026). Citation check: Solubility of Ca5{P04)3OH in the System Ca{OH)2-H3P04-H20 at 5, 15, 25, and 37 °C. https://app.cochat.ai/papers/10.6028/jres.081a.017
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- McDowell, H., Gregory, T. M., & Brown, W. E. (1977). Solubility of Ca5{P04)3OH in the System Ca{OH)2-H3P04-H20 at 5, 15, 25, and 37 °C. Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry. https://doi.org/10.6028/jres.081a.017
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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