Copper(II) arsenate

Copper(II) arsenate
IUPAC name Copper(II) arsenate
Other names Copper arsenate
Identifiers
CAS number	7778-41-8 Y
PubChem	26065
ChemSpider	24279 Y
Jmol-3D images	Image 1
SMILES [Cu+2].[Cu+2].[Cu+2].[O-][As]([O-])(=O)[O-].[O-][As]([O-])([O-])=O
InChI InChI=1S/2AsH3O4.3Cu/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6 Y Key: RKYSWCFUYJGIQA-UHFFFAOYSA-H Y InChI=1/2AsH3O4.3Cu/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6 Key: RKYSWCFUYJGIQA-CYFPFDDLAM
Properties
Molecular formula	Cu3(AsO4)2
Molar mass	468.48 g/mol
Appearance	blue or bluish green powder
Density	5.2 g/cm3
Melting point	1100 °C
Solubility in water	insoluble
Solubility	soluble in ammonia, dilute acids
Hazards
EU Index	Not listed
Y(what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Copper arsenate (Cu₃(AsO₄)₂.4H₂O, or Cu₅H₂(AsO₄)₄.2H₂O), also called copper orthoarsenate or tricopper arsenate or tricopper orthoarsenate, is a blue or bluish-green powder insoluble in water and alcohol and soluble in aqueous ammonium and dilute acids. Its CAS number is [7778-41-8] or [10103-61-4].

Uses

Copper arsenate is an insecticide used in agriculture. It is also used as a herbicide, fungicide, and a rodenticide. It is also used as a poison in slug baits.

Copper arsenate can also be a misnomer for copper arsenite, especially when meant as a pigment.

Natural occurences

Anhydrous copper arsenate, Cu₃(AsO₄)₂, is found in nature as the mineral lammerite.^[1] Copper arsenate tetrahydrate, Cu₃(AsO₄)₂.4H₂O, occurs naturally as the mineral rollandite.^[2]

Related compounds

Copper arsenate hydroxide or basic copper arsenate (Cu(OH)AsO₄) is a basic variant with CAS number [16102-92-4]. It is found naturally as the mineral olivenite. It is used as an insecticide, fungicide, and miticide. Its use is banned in Thailand since 2001.[1]

See also

• Lead arsenate
• Calcium arsenate
• Paris Green (copper arsenate-acetate)
• Chromated copper arsenate
• Scheele's Green (copper arsenite)

External links

Wikimedia Commons has media related to: Copper(II) arsenate

• National Pollutant Inventory - Copper and compounds fact sheet

References