Aluminium arsenate
{{chembox
| Watchedfields = changed
| verifiedrevid =
| Name = Aluminium arsenate
| ImageFile =
| ImageName =
| ImageFile1 =
| IUPACName =
| OtherNames = Aluminium arsenate
|Section1={{Chembox Identifiers
| CASNo = 13462-91-4
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo1 = 60763-04-4
| CASNo1_Ref = {{cascite|correct|CAS}}
| index1_label = (Octahydrate)
| ChemSpiderID = 10636688
| ChemSpiderID1 = 21391673
| DTXSID1 = DTXSID70647789
| PubChem = 57351442
| PubChem1 = 24884165
| QID1 = Q82560370
| RTECS =
| UNNumber =
| EINECS =
| InChI = 1S/Al.AsH3O4/c;2-1(3,4)5/h;(H3,2,3,4,5)/q+3;/p-3
| InChIKey = RCJAOTMBSRLOJZ-UHFFFAOYSA-K
| SMILES = [O-][As](=O)([O-])[O-].[Al+3]
| SMILES1 = O.O.O.O.O.O.O.O.O=[As]([O-])([O-])[O-].[Al+3]
| InChI1=1S/Al.AsH3O4.8H2O/c;2-1(3,4)5;;;;;;;;/h;(H3,2,3,4,5);8*1H2/q+3;;;;;;;;;/p-3
| InChIKey1 = CHNKHEXWDMIYLG-UHFFFAOYSA-K
}}
|Section2={{Chembox Properties
| Al=1 | As=1 | O=4
| Appearance = colourless crystals
| Density = 3.25 g/cm3
| Solubility = insoluble
| SolubilityProduct = 10−18.06 for {{chem2|2 AlAsO4.7 H2O}}.
| SolubleOther =
| MeltingPtC = 1000
| BoilingPt =
| RefractIndex = 1.596
}}
|Section3={{Chembox Structure
| CrystalStruct = hexagonal
}}
|Section4={{Chembox Thermochemistry
| DeltaHf = −1431.1 kJ/mol
| DeltaGf =
| Entropy = 145.6 J/mol K
| HeatCapacity =
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|Section7={{Chembox Hazards
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| FlashPt =
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|Section8={{Chembox Related
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Aluminium arsenate is an inorganic compound with the formula {{chem2|AlAsO4}}.[http://chemister.ru/Database/properties-en.php?dbid=1&id=5279 Aluminum arsenate at Chemister] 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.Chemistry of Arsenic, Antimony, and Bismuth, Edited by N. C. Norman. page 131, Anhydrous form is known as an extremely rare, fumarolic mineral alarsite{{Cite web|url=https://www.mindat.org/min-94.html|title = Alarsite}} A synthetic hydrate of aluminium arsenate is produced by hydrothermal method. with the formulation {{chem2|Al2O3*3As2O5*10H2O}}.{{cite journal |url= http://www.minsocam.org/ammin/AM39/AM39_1005.pdf |title= A new synthetic hydrate of aluminum arsenate |first1= Gerald |last1= Katz |first2= Horst |last2= Kedesdy |pages= 1005–1017 |journal= American Mineralogist |year= 1954 |volume= 39 |issue= 11–12)}}
Modification of aluminium orthoarsenate was carried out by heating different samples to different temperatures. Both amorphous and crystalline forms were obtained.B. Sharan "A new modification of aluminum ortho-arsenate" Acta Crystallogr. 1959, vol. 12, 948-949. {{doi|10.1107/S0365110X59002729}} The solubility product was determined to be 10−18.06 for aluminium arsenate hydrate of formula {{chem2|AlAsO4*3.5H2O}}.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}}
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
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{{Aluminium compounds}}