Aluminium arsenate

In today's world, Aluminium arsenate has become a topic of great relevance and interest to a wide spectrum of the public. Whether due to its impact on society, its historical relevance or its influence in the professional field, Aluminium arsenate has captured the attention of many people around the world. This article seeks to explore different aspects related to Aluminium arsenate, from its origins and evolution to its current state and possible future implications. Through a detailed analysis, the aim is to provide the reader with a complete and enriching vision of Aluminium arsenate, and to encourage reflection and debate around this topic of global importance.

Aluminium arsenate
Names
Other names
Aluminium arsenate
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/Al.AsH3O4/c;2-1(3,4)5/h;(H3,2,3,4,5)/q+3;/p-3
    Key: RCJAOTMBSRLOJZ-UHFFFAOYSA-K
  • (Octahydrate): InChI=1S/Al.AsH3O4.8H2O/c;2-1(3,4)5;;;;;;;;/h;(H3,2,3,4,5);8*1H2/q+3;;;;;;;;;/p-3
    Key: CHNKHEXWDMIYLG-UHFFFAOYSA-K
  • (=O)().
  • (Octahydrate): O.O.O.O.O.O.O.O.O=()().
Properties
AlAsO4
Molar mass 165.899 g·mol−1
Appearance colourless crystals
Density 3.25 g/cm3
Melting point 1,000 °C (1,830 °F; 1,270 K)
insoluble
10−18.06 for 2 AlAsO4.7 H2O.[1]
1.596
Structure
hexagonal
Thermochemistry
145.6 J/mol K
−1431.1 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).

Aluminium arsenate is an inorganic compound with the formula AlAsO4.[2] It is most commonly found as an octahydrate. It is a colourless solid that is produced by the reaction between sodium arsenate and a soluble aluminium salt. Aluminium arsenate occurs naturally as the mineral mansfieldite.[3] Anhydrous form is known as an extremely rare, fumarolic mineral alarsite[4] A synthetic hydrate of aluminium arsenate is produced by hydrothermal method. with the formulation Al2O3·3As2O5·10H2O.[5]

Modification of aluminium orthoarsenate was carried out by heating different samples to different temperatures. Both amorphous and crystalline forms were obtained.[6] The solubility product was determined to be 10−18.06 for aluminium arsenate hydrate of formula AlAsO4·3.5H2O.[1] Like gallium arsenate and boron arsenate, it adopts the α-quartz-type structure. The high pressure form has a rutile-type structure in which aluminium and arsenic are six-coordinate.

References

  1. ^ a b Fernando L. Pantuzzo, Luciano R.G. Santos, Virginia S.T. Ciminelli "Solubility-product constant of an amorphous aluminum-arsenate phase (AlAsO4·3.5H2O) at 25 °C" Hydrometallurgy Volumes 2014, 144–145, Pages 63–68. doi:10.1016/j.hydromet.2014.01.001
  2. ^ Aluminum arsenate at Chemister
  3. ^ Chemistry of Arsenic, Antimony, and Bismuth, Edited by N. C. Norman. page 131,
  4. ^ "Alarsite".
  5. ^ Katz, Gerald; Kedesdy, Horst (1954). "A new synthetic hydrate of aluminum arsenate" (PDF). American Mineralogist. 39 (11–12)): 1005–1017.
  6. ^ B. Sharan "A new modification of aluminum ortho-arsenate" Acta Crystallogr. 1959, vol. 12, 948-949. doi:10.1107/S0365110X59002729