Question #17d18

1 Answer
May 22, 2017

Answer:

#1.2 xx 10^-10M#

Explanation:

We're trying to find the #[H_3O^+]# of a solution with a given #pOH#.

We know that #pH# and the #pOH# must add up to #14.00#:

#pH + pOH = 14.00#

and the relationship between #pH# and the #[H_3O^+]# is

#[H_3O^+] = 10^(-pH)#

Thus,

#pH = 14.00 - 4.07 = 9.93#

#[H_3O^+] = 10^(-9.93) = color(red)(1.2 xx 10^-10 M#