Calculate the hydroxide ion concentration, [OH−] , for a solution with a pH of 7.44 . [OH−]=

Question

Calculate the hydroxide ion concentration, [OH−] , for a solution with a pH of 7.44 . [OH−]=

Answer 1

Hello, Joana,

Pure water at ambient temperature has an equilibrium coefficient for [H⁺] and [OH^-] of 1x10^-14. If the concentrations are equal, at 1x10^-7 each, the solution is neutral. The negative log of 1x10^-7 is 7. pH and pOH are both 7 at this point.

This makes a convenient system for calculating the pOH once you know the pH: pH + pOH = 14.

14 - 7.44 = 6.56

pOH = 6.56

Bob