Amphoteric Compounds

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Sydney Tay 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:20 am

Amphoteric Compounds

Postby Sydney Tay 2B » Thu Dec 06, 2018 5:13 pm

For the question in the 6th edition textbook 12.17 how can you tell if a compound is amphoteric or not? Specifically looking at As2O3 and Bi2O3, how can you tell that these compounds are amphoteric?

A De Castro 14B 2H
Posts: 75
Joined: Fri Sep 28, 2018 12:29 am

Re: Amphoteric Compounds

Postby A De Castro 14B 2H » Thu Dec 06, 2018 5:35 pm

A compound is amphoteric if it is able to react as both a Lewis base (lone pair donor) and as a Lewis acid (lone pair acceptor). Also, metal oxides (Na2O, CaO) react with water to form strong bases, while nonmetal oxides (ex. CO2, SO2) react with water to form acids. As for As2O3 and Bi2O3, they're amphoteric because As and Bi located near a diagonal band between metals and nonmetals (closely matching the diagonal band of metalloids), so they have both basic and acidic character.

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