what are the concentrations of hydrogen ions and hydroxide ions in a solution that has a oh of 5? *please include work done so I can understand*

Answer 1

pH = 5
pH + pOH = pKw = 14 from which you can find pOH.
Then pH = -log(H^+)
and pOH = -log(OH^-).
If pH = 5, then H^+ = 1E-5. You get that straight from the calculator.
If pH = 5, then pOH = 9 and OH^- = 1E-9 (straight from the calculator) but you can do those in your head.