Please explain what formula i would use and how to input it into my calculator

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)

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