Kw - applies to solutions other than 100% water?

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Dayna Pham 1I
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Kw - applies to solutions other than 100% water?

Postby Dayna Pham 1I » Wed Jan 23, 2019 9:09 pm

For 12.21 in the Sixth Edition, we are suppose to solve for either [H3O+] or [OH-] using the Kw relationship, [H3O+][OH-] = 10^-14. Can we use this relationship to solutions other than 100% water? I thought that Kw was only for water but it doesn't say in the question whether the solution is water-based or not.

Anushi Patel 1J
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Re: Kw - applies to solutions other than 100% water?

Postby Anushi Patel 1J » Wed Jan 23, 2019 9:15 pm

I think we are supposed to assume the solvent is water. Also, I think you can always use Kw to relate [H3O+] and [OH-].

Kyle Golden Dis 2G
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Re: Kw - applies to solutions other than 100% water?

Postby Kyle Golden Dis 2G » Wed Jan 23, 2019 9:16 pm

The question implies that it is about water since it has hydroxide and hydronium ion.

Angela Grant 1D
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Re: Kw - applies to solutions other than 100% water?

Postby Angela Grant 1D » Wed Jan 23, 2019 10:27 pm

Kw implies that the solution is water since the expression represents the autoprotolysis of water


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