Cadmium phosphate

Not to be confused with Cadmium phosphide.

Cadmium phosphate

Names
IUPAC name Cadmium phosphate
Identifiers
CAS Number	13477-17-3
3D model (JSmol)	Interactive image
ChemSpider	24274
ECHA InfoCard	100.033.408
EC Number	236-764-9
PubChem CID	26060
CompTox Dashboard (EPA)	DTXSID60889611
InChI InChI=1S/3Cd.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6 Key: NRGIRRZWCDKDMV-UHFFFAOYSA-H
SMILES [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Cd+2].[Cd+2].[Cd+2]
Properties
Chemical formula	Cd3(PO4)2
Molar mass	527.18 g/mol
Appearance	White solid [1]
Density	5.17 g/cm3 [1]
Melting point	1,500 °C (2,730 °F; 1,770 K)
Solubility in water	Insoluble
Solubility product (Ksp)	2.53 × 10–33
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Cadmium phosphate is an inorganic phosphate salt of cadmium, with the molecular formula Cd₃(PO₄)₂. ^[2] It is a white, water-insoluble solid.

Synthesis

Tricadmium phosphate can be prepared by the reaction of cadmium chloride with diammonium phosphate at 800 °C: ^[3]

3 CdCl₂ + 2 (NH₄)₂HPO₄ → Cd₃(PO₄)₂ + 4 NH₄Cl + 2 HCl

The precipitation of aqueous cadmium ions with soluble phosphate sources, such as trisodium phosphate and phosphoric acid, does not produce Cd₃(PO₄)₂, but instead produces a hydrate of cadmium with the formula Cd₅H₂(PO₄)₄·4H₂O. When this compound is heated, it yields a mixture of cadmium phosphate and cadmium pyrophosphate, Cd₂P₂O₇. ^[4]

Uses

Cadmium phosphate can be used as a fertilizer to provide phosphorus to crops for their growth. ^[2]

See also

• Cadmium phosphide

References

1. Cherif, Fatima-Zahra; Taibi, Mhamed; Boukhari, Ali; Assani, Abderrazzak; Saadi, Mohamed; El Ammari, Lahcen (2023-12-01). "Crystal structure reinvestigation and spectroscopic analysis of tricadmium orthophosphate" (PDF). Acta Crystallographica Section E: Crystallographic Communications. 79 (12): 1155–1160. Bibcode:2023AcCrE..79.1155C. doi: 10.1107/S2056989023009775 . ISSN   2056-9890. PMC   10833404 . PMID   38313125 . Retrieved 2025-05-22.
2. "Cadmium Phosphate". PubChem. Retrieved 22 May 2025.
3. Dollase, W. A.; Feike, M.; Förster, H.; Schaller, T.; Schnell, I.; Sebald, A.; Steuernagel, S. (1997-04-01). "A 2D 31 P MAS NMR Study of Polycrystalline Cd 3 (PO 4 ) 2". Journal of the American Chemical Society. 119 (16): 3807–3810. Bibcode:1997JAChS.119.3807D. doi:10.1021/ja9636808. ISSN   0002-7863 . Retrieved 2025-05-22.
4. R. C. Ropp; R. W. Mooney (1960). "Phosphates of Cadmium". Journal of the American Chemical Society. 82 (18): 4848–4852. Bibcode:1960JAChS..82.4848R. doi:10.1021/ja01503a025.