# The pH of a solution is 8.7, what is the pOH?

##### 1 Answer

Jul 5, 2016

#### Answer:

**pOH = 5.3**

#### Explanation:

You can answer this question in one of two ways:

- Take the anti-log of the pH to obtain the concentration of
#H^+# ions in solution. After that, use the self-ionization of water formula:

Where

- Subtract the pH from 14 to obtain the pOH.

I'll show you both ways using these equations:

**THE PROCESS FOR METHOD 1:**

**Kw / [H+] = [OH-]**

**THE PROCESS FOR METHOD 2:**