A solution has [H3O+]
[
H
3
O
+
]
= 6.2×10−5 M
M
. Use the ion product constant of water
Kw=[H3O+][OH−]
K
w
=
[
H
3
O
+
]
[
O
H
−
]
to find the [OH−]
[
O
H
−
]
of the solution.
First, we can use the ion product constant of water to find the concentration of hydroxide ions:
Kw = [H3O+][OH-]
1.0 x 10^-14 = (6.2 x 10^-5)[OH-]
[OH-] = 1.6 x 10^-10 M
Therefore, the concentration of hydroxide ions in the solution is 1.6 x 10^-10 M.