# What is the #[OH^-]# in a solution that has a #[H_3O]=1.0*10^-6# #M#?

##### 1 Answer

Jul 30, 2016

The solution has a

#### Explanation:

The answer can be obtained one of two ways:

#color(red)("Use the auto-ionization constant of water equation, Kw:"#

All you would have to do is rearrange the equation to solve for#[OH^(-)]# by dividing both sides of the equation by#[H_3O^(+)]:#

Plug in the known concentration of

2.

Determine the pH of the solution by taking the negative logarithm

(-log) of the concentration of

Then obtain the pOH using the equation:

Finally, you take the anti log (inverse of the natural logarithm),