Neodymium arsenate

Neodymium arsenate
Names

Other names Neodymium(III) arsenate
Identifiers
CAS Number	15479-84-2^Y
3D model (JSmol)	Interactive image
InChI InChI=1S/AsH3O4.Nd/c2-1(3,4)5;/h(H3,2,3,4,5);/q;+3/p-3 Key: NDJXBXBULAKKIO-UHFFFAOYSA-K
SMILES [O-][As](=O)([O-])[O-].[Nd+3]
Properties
Chemical formula	NdAsO₄
Molar mass	313.89
Appearance	faint pink powder
Density	5.3-5.9 g/cm³^[1]
Solubility in water	insoluble
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H314, H350, H410
Precautionary statements	P201, P264, P273, P280, P305+P351+P338, P310
Related compounds
Other anions	Neodymium(III) nitrate Neodymium(III) phosphate Neodymium(III) antimonate Neodymium(III) bismuthate Neodymium(III) carbonate
Other cations	PrAsO₄
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

Neodymium arsenate, also known as neodymium(III) arsenate, is the arsenate of neodymium with the chemical formula of NdAsO₄. In this compound, neodymium exhibits the +3 oxidation state. It has good thermal stability, and its pK_sp,c is 21.86±0.11.^[2]

Preparation

Neodymium arsenate can be obtained from the reaction between sodium arsenate (Na₃AsO₄) and neodymium chloride (NdCl₃) in solution:^[3]

Na₃AsO₄ + NdCl₃ → 3 NaCl + NdAsO₄↓

When crystallizing from a lead pyroarsenate flux, neodymium arsenate crystals produced explode when cooled.^[4]

Neodymium arsenate also occurs in nature as a mineral.^[5]

References

^ Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. M71.
^ Firsching, F. Henry. (1992). "Solubility products of the trivalent rare-earth arsenates". Journal of Chemical and Engineering Data. 37 (4): 497–499. doi:10.1021/je00008a028.
^ Gabisoniya, Ts. D.; Nanobashvili, E. M.. Synthesis of rare earth metal arsenates. Soobshcheniya Akademii Nauk Gruzinskoi SSR (1980), 97(2), 345-8. ISSN 0002-3167
^ Feigelson, Robert S. (August 1967). "Crystal Growth of Rare-Earth Orthoarsenates". Journal of the American Ceramic Society. 50 (8): 433–434. doi:10.1111/j.1151-2916.1967.tb15150.x.
^ "New Mineral Names". American Mineralogist. 85: 1321–1325. 2000.