The arsenate is an ion with the chemical formula AsO3−4. 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.
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👉 Arsenate in the context of Phosphate mineral
Phosphate minerals are minerals that contain the tetrahedrally coordinated phosphate (PO3−4) anion, sometimes with arsenate (AsO3−4) and vanadate (VO3−4) substitutions, along with chloride (Cl), fluoride (F), and hydroxide (OH) anions, that also fit into the crystal structure.
The phosphate class of minerals is a large and diverse group, however, only a few species are relatively common.
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Arsenate in the context of Arsenic acid
Arsenic acid or arsoric acid is the chemical compound with the formula H3AsO4, more descriptively written as AsO(OH)3. This colorless acid is the arsenic analogue of phosphoric acid. Arsenate and phosphate salts behave very similarly. Arsenic acid as such has not been isolated, but is only found in solution, where it is largely ionized. Its hemihydrate form (2H3AsO4·H2O) does form stable crystals. Crystalline samples dehydrate with condensation at 100 °C.