1a. If the H+ concentration is 0.0001 M, what is the pH? 1B. If the H+ concentration is 0.00001 M, what is the OH- concentration? 1c. If a soil has a pH of 5, what is the H+ concentration of the soil solution? 1d. The H+ concentration of a solution is 0.001M. a. Calculate the pH, POH. Is this an acidic or basic solution? b. What is the concentration of OH-? c. What is the ratio of H+ to OH-?

I have the answers to these but I don't know how to find them. Can someone please explain how to approach these?