Arsenates

Arsenates

Arsenic 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 only found in solution where it is largely ionized. Its hemihydrate form (H3AsO4·½H2O) does form stable crystals. Crystalline samples dehydrate with condensation at 100 °C.

Read more about Arsenates:  Properties, Preparation, Applications

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Arsenite - Bacteria Using and Generating Arsenate
... obtain their energy by oxidizing various fuels while reducing arsenates to form arsenites ... The enzymes involved are known as arsenate reductases ... photosynthesis with arsenites as electron donors, producing arsenates (just like ordinary photosynthesis uses water as electron donor, producing molecular oxygen) ...
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... Arsenates occur naturally in a variety of minerals ... Those minerals may contain hydrated or anhydrous arsenates ... Unlike phosphates, arsenates are not lost from a mineral during weathering ...
Bacteria Using and Generating Arsenate
... species of bacteria obtain their energy by oxidizing various fuels while reducing arsenates to form arsenites ... The enzymes involved are known as arsenate reductases ... with arsenites as electron donors, producing arsenates (just like ordinary photosynthesis uses water as electron donor, producing molecular oxygen) ...
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08.A Arsenates without additional anions, without H2O 08.AA With small cations (some also with larger ones) 05 Alarsite 08.AB With medium-sized cations 25 Xanthiosite, 30 Lammerite ...