I am in a rush, and I am trying to learn how to do learn how to work out this problem. A lake in Utah has a hydronium ion (H3O+) concentration of...

I need help with this question. I am in a rush, and I am trying to learn how to do learn how to work out this problem. A lake in Utah has a hydronium ion (H3O+) concentration of 4.60 x 10-9 M. Calculate the pH of the water. Work must be shown in order to earn credit.