Calculate the pH of a solution that has a hydroxide ion concentration, [OH−] , of 5.29×10−8 M. pH=

Question

Calculate the pH of a solution that has a hydroxide ion concentration, [OH−] , of 5.29×10−8 M. pH=

Answer 1

Hello, Joana,

pH is the negative log of the H⁺ concentration. Water has an equilibrium coefficient of 1x10^-14 for [H⁺][OH^-].

Therefore we can calculate the [H⁺] as follows:

1x10^-14 = [H⁺][5.29x10^-8]

[H⁺] = 1.89x10^-7

log [H⁺] = -6.72

-log [H⁺] = 6.72

pH = 6.72

pOH = 14 - 6.72

pOH = 7.28

Bob