Metathesis of sodium phosphate and calcium nitrate
Low intensity Ca peaks are also observed in the product spectra, consistent with incomplete coverage of the CaHAp growth substrate. The XRD pattern of the product after 48 h reflux clearly shows the PbHAp phase as the major product phase with the intensity of PbHAp peaks considerably increased, indicating. The inset shows the locations sampled for the spectra. PbHAp crystal product is present as hexagonal rod-shaped.
The presence ofboth phases results from difficulty separating the finely divided PbHAp phase from the approximately fold excess CaHAp reactant substrate phase. The CaHAp reactant material was not calcined and shows broad water O-H stretching vibrational bands centered about cm-1 in the CaHAp spectrum with the rOH apatite band as a shoulder at cm-1, similar to reported values of  and cm-1 .
A small sharp O-H stretching mode appears at cm-1 in the product spectra, which compares favorably with the apatite bands and the reported  rOH vibrational stretching band for pure PbHAp at cm A broad band in the cm-1 region and a weak. As all the IR spectroscopy samples were prepared in the same manner, loss of these broad peaks on refluxing indicates that they are due to water associated with the reactant substrate phase. The carbonate may come from the incorporation of atmospheric CO2 through equilibrium with the alkaline reaction solution during the synthesis step.
The reflux method of CaHAp dissolution to provide phosphate anion in the presence of lead cation succeeds for producing larger sized crystals of the less soluble PbHAp from the aqueous solution. Hexagonal rod-shaped crystals of PbHAp formed and product crystal size increased with increasing reflux-reaction time. IR results indicate the incorporation of carbonate in the CaHAp substrate resulting in increased solubility of this material, but the carbonate anion does not appear to carry over into the PbHAp product crystals.
The authors declare that there is no conflict of interests regarding the publication of this paper. Moriguchil, S.
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US2609271A - Production of calcium phosphates and calcium nitrate - Google Patents
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Net Ionic Equations answers - Mrs. Norquist's Chemistry
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Pre-laboratory Assignment: Types of Reactions
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