# If the H3O+ of a solution is 5.62x10-12M, what is the OH of the same solution? Assuming 25 degrees celcuis?

At 25°C, ${K}_{w} = \left[O {H}^{-}\right] \left[{H}^{+}\right] = 1.0 \cdot {10}^{-} 14$.
$1.0 \cdot {10}^{-} 14 = \left(5.62 \cdot {10}^{-} 12 M\right) \left[O {H}^{-}\right]$
$\therefore \left[O {H}^{-}\right] \approx 1.78 \cdot {10}^{-} 3 M$