Thank you for the opportunity to help you with your question!
the equation for pH is pH = - log [H3O+] where the log os log base-10; this gives you pH from the [H3O+]
to get [H3O+] from pH, you need to "undo" this equation by solving for [H3O+], which is [H3O+]=10^(-pH)
so take the negative of the pH, and do 10 to that power...that gives you the H3O+ concentration if you know the pH
So, in our case [H3O+] = 10^(-8) = 1*10^(-8)
Please let me know if you need any clarification. I'm always happy to answer your questions.
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