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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.
I think we are supposed to assume the solvent is water. Also, I think you can always use Kw to relate [H3O+] and [OH-].
The question implies that it is about water since it has hydroxide and hydronium ion.
Kw implies that the solution is water since the expression represents the autoprotolysis of water
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