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Posted: Fri Dec 08, 2017 12:45 am
How can you determine if an oxide is acidic basic or amphoteric. The examples from this question are BaO, SO3, As2O3, Bi2O3
Posted: Fri Dec 08, 2017 4:58 am
Typically, non metal oxides are acidic. Metal oxides are basic. And semi metal oxides are amphoteric. If you can't determine it from that, then it's always a safe bet to draw the Lewis Structure and see if there are any lone pairs available (base), if it's an incomplete octet (acid). If it could go for either, it's amphoteric.
Posted: Sat Dec 09, 2017 1:18 pm
For SO4, I understand that it's a nonmetal, and therefore going to be acidic, but when I draw the lewis structure, there doesn't seem to be any need for it to accept any more electrons. So why is it still acidic?