What is the concentration of hydroxyl ions in a solution of pH #8# ?

1 Answer
Feb 5, 2018

Answer:

#10^(-6)# mol per litre

Explanation:

#pH# is #-log_10# of the hydrogen ion concentration (actually hydronium #H_3O^+# concentration).

#pOH# is #-log_10# of the hydroxyl (#OH^-#) ion concentration.

To say #pH + pOH = 14# is to say that the product of the #H_3O^+# and #OH^-# ion concentrations is #10^-14#.

If a solution has #pH = 8#, then its #pOH# is #14-8 = 6# and the corresponding concentration of hydroxyl #OH^-# ions is #10^(-6)# mol per litre.