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Names | |||
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IUPAC name
Arsenate
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Identifiers | |||
3D model (JSmol)
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ChemSpider | |||
PubChem CID
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UNII | |||
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Properties | |||
AsO3−4 | |||
Molar mass | 138.918 g·mol−1 | ||
Conjugate acid | Arsenic acid | ||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards
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Extremely toxic, carcinogenic | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The arsenate is an ion with the chemical formula AsO3−4.[1] 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.[2] The four oxygen atoms orient around the arsenic atom in a tetrahedral geometry.[2] Resonance disperses the ion's −3 charge across all four oxygen atoms.
Arsenate readily reacts with metals to form arsenate metal compounds.[2][3] Arsenate is a moderate oxidizer and an electron acceptor, with an electrode potential of +0.56 V for its reduction to arsenite.[4] Due to arsenic having the same valency and similar atomic radius to phosphorus, arsenate shares similar geometry and reactivity with phosphate.[5] Arsenate can replace phosphate in biochemical reactions and is toxic to most organisms.[5][6]
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