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Postby GFolk_1D » Mon Dec 02, 2019 11:58 am

How can you tell which is the base and which is the acid in the formula:

H2O2 + SO3 -----> H2SO5

I tried drawing lewis structures but still don't quite understand. Thanks!

Rachel Yu 1G
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Joined: Fri Aug 09, 2019 12:15 am

Re: 6.5

Postby Rachel Yu 1G » Mon Dec 02, 2019 12:25 pm

SO3 is the Lewis acid while H2O2 is the Lewis base. In this question, think of H202 as 2 OH, where one has a lone pair. When forming H2SO5, SO3 breaks one of its double bonds with oxygen and finds to an OH pair with lone pairs. Therefore, SO3 is accepting the OH lone pairs and serves as the Lewis acid.

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