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Reference.org
Copper(II) arsenate
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<p>Copper arsenate (Cu3(AsO4)2·4H2O, or Cu5H2(AsO4)4·2H2O), also called copper orthoarsenate, tricopper arsenate, cupric arsenate, or tricopper orthoarsenate, is a blue or bluish-green powder insoluble in water and alcohol and soluble in aqueous <a href="/facts/Ammonium/jYm8wc1n">ammonium</a> and dilute acids. </p>