Please I need help in knowing how to solve this. I know I need to take the antilog of something but don't know what.What is the values of [H3O+] for a solution with [OH−]=1×10−5M?

2 answers

that isn't helpful
No, you don't need the antilog to do this one.
(H3O^+)(OH^-) = Kw = 1E-14.
You know OH^- and Kw, solve for (H3O^+.