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How can you tell that As2O3 or Bi2O3 is amphoteric? They are amphoteric because they are metalloids; however, can you figure it out by writing out a chemical equation for a reaction of these oxides with water like you can do for BaO?
To be amphoteric means that the oxide can react either with acid or base. In the case of As2O3 we have: As2O3 + 6HCl --> 2AsCl3 + 3H2O (reaction with acid) NaOH + As2O3 + 3H2O --> 2Na[As(OH)4] (reaction with base) Something similar would apply to Bi2O3.
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