Copper(II) arsenate

Chemical compound From Wikipedia, the free encyclopedia

Copper arsenate is an inorganic compound with the chemical formula Cu3(AsO4)2·nH2O (n=0,4). It is a blue or bluish-green solid, forming monoclinic crystals.

Quick facts Names, Identifiers ...
Copper(II) arsenate
Names
IUPAC name
Copper(II) arsenate
Other names
  • Copper arsenate
  • Copper orthoarsenate
  • Cupric arsenate
  • Tricopper arsenate
  • Tricopper orthoarsenate
Identifiers
3D model (JSmol)
ChemSpider
UNII
  • InChI=1S/2AsH3O4.3Cu/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6 checkY
    Key: RKYSWCFUYJGIQA-UHFFFAOYSA-H checkY
  • InChI=1/2AsH3O4.3Cu/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6
    Key: RKYSWCFUYJGIQA-CYFPFDDLAM
  • [Cu+2].[Cu+2].[Cu+2].[O-][As]([O-])(=O)[O-].[O-][As]([O-])([O-])=O
Properties
Cu3(AsO4)2
Molar mass 468.48 g/mol
Appearance blue or bluish green solid
Density 5.2 g/cm3
Melting point 1,100 °C (2,010 °F; 1,370 K)
insoluble
7.95×10−36[1]
Solubility insoluble in alcohol
soluble in ammonia solution, dilute acids
Structure[2]
monoclinic
P21/c
a = 6.327 Å, b = 8.642 Å, c = 11.313 Å
α = 92.04°, β = 90°, γ = 90°
4 units per cell
Hazards
GHS labelling:[3]
GHS07: Exclamation markGHS08: Health hazard
Danger
H319, H350, H361, H370, H372
P203, P260, P264, P264+P265, P270, P280, P305+P351+P338, P308+P316, P318, P319, P321, P337+P317, P405, P501
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1 mg/m3 (as Cu)[4]
REL (Recommended)
 TWA 1 mg/m3 (as Cu)[4]
IDLH (Immediate danger)
 TWA 100 mg/m3 (as Cu)[4]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Occurrence

Anhydrous copper arsenate (Cu3(AsO4)2) is found in nature as the mineral lammerite.[5] The tetrahydrate (Cu3(AsO4)2·4H2O) occurs naturally as the mineral rollandite.[6]

Preparation

Copper arsenate can be prepared by reacting disodium hydrogen arsenate and copper(II) chloride in aqueous solution.[2]

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.

Related compounds

Basic copper arsenates with the formulas Cu2(OH)AsO4 and Cu3(AsO4)(OH)3 have been observed.[7] The former is found naturally as the mineral olivenite.

See also

References

External links

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