Question

A solution has an [H+] or [H3O+] of 1.25 X 10-9. What is the [OH-]?

a.01.25 X 105
b.8.00 X 10-6
c.None are correct
d.0.875
e.1.25 X 10-23

Answer 1

i believe the answer is c

Answer 2

C. None of these are correct
Answer is 8 x 10^-6

Found by:
Kw = [H3O+] [OH-] = 1 x 10^-14
( 1 x 10^-14) / (1.25 x 10^-9)
= 8 x 10^-6