Practice Problems

Convert each hydroxide ion concentration into a pOH. Identify each as an acidic pOH or a basic pOH.

1) 0.0045 pOH = - log 0.0045 = - (- 2.35) = 2.35
This is a basic pOH.

2) 5.0 x 10¯10

pOH = - log 5.0 x 10¯10 - (- 9.30) = 9.30
This is an acidic pOH.

3) 1.0

pOH = - log 1.0 = - (-0.00) = 0.00
This is a basic pOH.

4) 3.27 x 10¯3

pOH = - log 3.27 x 10¯3 = - (- 2.485) = 2.485
This is a basic pOH.

5) 1.00 x 10¯12

pOH = - log 1.00 x 10¯12 = 12.000
This is an acidic pOH.

6) 0.00010

pOH = - log 0.00010 = 4.0
This is a basic pOH.

Keep in mind that the pH + pOH = 14. The ChemTeam also keeps in mind that acidic pH runs up to 7. So, if I have a pOH = 4, I then know that the pH = 10 and that this is a basic solution.

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