Aluminium arsenate

Aluminium arsenate  Names

Other names

Aluminium arsenate

Identifiers

CAS Number

* 13462-91-4 Y
* (Octahydrate): 60763-04-4 Y

3D model (JSmol)

* Interactive image
* (Octahydrate): Interactive image

ChemSpider |

* 10636688
* (Octahydrate): 21391673

PubChem CID

* 57351442
* (Octahydrate): 24884165

CompTox Dashboard (EPA)

* (Octahydrate): DTXSID70647789

InChI

* 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

SMILES

* [O-][As](=O)([O-])[O-].[Al+3]

* (Octahydrate): O.O.O.O.O.O.O.O.O=[As]([O-])([O-])[O-].[Al+3]

Properties

Chemical formula

| 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)

Solubility in water

| insoluble

Solubility product (Ksp)

| 10−18.06 for 2 AlAsO
4.7 H
2O.[1]

Refractive index (nD)

| 1.596
Structure

Crystal structure

| hexagonal
Thermochemistry

Std molar
entropy (S ~~o~~ 298)

| 145.6 J/mol K

Std enthalpy of
formation (ΔfH⦵298)

| −1431.1 kJ/mol

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Aluminium arsenate is an inorganic compound with the formula AlAsO
4.[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 Al

3 * 3As

5 * 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 AlAsO
4 * 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. ↑ 1.0 1.1 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". https://www.mindat.org/min-94.html.
5. ↑ Katz, Gerald; Kedesdy, Horst (1954). "A new synthetic hydrate of aluminum arsenate". American Mineralogist 39 (11–12)): 1005–1017. http://www.minsocam.org/ammin/AM39/AM39_1005.pdf.
6. ↑ B. Sharan "A new modification of aluminum ortho-arsenate" Acta Crystallogr. 1959, vol. 12, 948-949. doi:10.1107/S0365110X59002729

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Aluminium compounds

Al(I)|

* AlBr
* AlCl
* AlF
* AlI
* Al2O

Al(II)|

* AlB2
* AlB12
* AlO

Al(III)|

* AlAs
* Al(BH4)3
* AlBr3
* AlCl3
* AlF3
* AlH3
* AlI3
* AlN
* Al(NO3)3
* Al2(CO3)3
* Al(OH)3
* Al(OH)2OAc
* Al(OH)(OAc)2
* Al(OAc)3
* Al2SO4(OAc)4
* AlP
* AlPO4
* AlSb
* Al(C5H7O2)3
* Al(MnO4)3
* Al2(MoO4)3
* Al2O3
* Al2S3
* Al2(SO4)3
* Al2Se3
* Al2Te3
* Al2SiO5
* Al4C3
* AlOHO
* Al(OH)2CO2C17H5
* NaAlH2(OC2H4OCH3)2
* LiAlH2(OC2H4OCH3)2

| Alums|

* (NH4)Al(SO4)2
* KAl(SO4)2
* NaAl(SO4)2

|

Organoaluminium(III) compounds|

* (Al(CH3)3)2
* (Al(C2H5)3)2
* Al(CH2CH(CH3)2)3
* Al(C2H5)2Cl
* Al(C2H5)2CN
* Al(CH2CH(CH3)2)2H
* Al(C2H5)2Cl2C2H5Cl
* Ti(C5H5)2CH2ClAl(CH3)2

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