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Reactive metals such as iron will reduce arsenic acid (H3AsO4) to the highly poisonous arsine gas (AsH3) in the presence of acid.What mass of iron would be required for such a reaction with 250 mL of 0.90 M arsenic acid,assuming that the iron is oxidized to Fe3+?
3 H3AsO4 + 8 Fe + 24 H+ → 3 AsH3 + 12 H2O + 8 Fe3+
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