Use the References to acceas important valuea if The hydronium ion concentration in an aqueous solution at 25 \'C is 2.2 102 M The hydroxide ion concentration is The pH of this solution is The pOH is M. Submit Answer Solution [H 3 O + ] = 2.2 x 10 -2 M [H 3 O + ][OH - ] = 1.0 x 10 -14 [OH - ] = 1.0 x 10 -14 / [H 3 O + ] => 1.0 x 10 -14 / 2.2 x 10 -2 Hydroxide ion concentration [OH - ] = 4.5 x 10 -13 M pH = - log [H 3 O + ] => - log (2.2 x 10 -2 ) pH = 1.66 pOH = - log [OH - ] => - log (4.5 x 10 -13 ) pOH = 12.34 .