As I read in my textbook, aquaporins exclude $H^+$ when absorbing water, but where does this $H^+$ come from? Additionally, is $H_3O^+$ a liquid that looks like regular water?


closed as off-topic by canadianer, AliceD Oct 11 '17 at 10:32

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  • $\begingroup$ $\ce{H_3O^+}$ is just representation of acidic water. You'd get much better answers about this on chemistry.SE $\endgroup$ – another 'Homo sapien' Oct 10 '17 at 16:42

It doesn't matter where the $H^+$ comes from in the context of this information. The textbook is just saying that the aquaporin is permeable to $H_2O$ but not to $H_3O^+$ (nor, presumably, to $OH^-$).

In any aqueous solution, especially in the presence of acids, some of the molecules will be $H_3O^+$. The pH tells you how many. It doesn't really make sense to think about what a solution of $H_3O^+$ would look like.


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