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Topic summary

Arsenate

Arsenate
Names IUPAC name
Arsenate
Identifiers
3D model (JSmol)
ChemSpider
UNII
  • InChI=1S/AsH3O4/c2-1(3,4)5/h(H3,2,3,4,5)/p-3
    Key: DJHGAFSJWGLOIV-UHFFFAOYSA-K
  • InChI=1/AsH3O4/c2-1(3,4)5/h(H3,2,3,4,5)/p-3
    Key: DJHGAFSJWGLOIV-DFZHHIFOAQ
  • [O-][As+]([O-])([O-])[O-]
Properties AsO3−4Molar mass138.918 g·mol Conjugate acidArsenic acidHazards Occupational safety and health (OHS/OSH):
Main hazards
Extremely toxic, carcinogenic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

The arsenate is an ion with the chemical formulaAsO3−4. Bonding in arsenate consists of a central arsenic atom, with oxidation state +5, double bonded to one oxygen atom and single bonded to a further three oxygen atoms. The four oxygen atoms orient around the arsenic atom in a tetrahedral geometry. Resonance disperses the ion's −3 charge across all four oxygen atoms.

Arsenate readily reacts with metals to form arsenate metal compounds. Arsenate is a moderate oxidizer and an electron acceptor, with an electrode potential of +0.56 V for its reduction to arsenite. Due to arsenic having the same valency and similar atomic radius to phosphorus, arsenate shares similar geometry and reactivity with phosphate. Arsenate can replace phosphate in biochemical reactions and is toxic to most organisms.

Wikipedia source