How do you calculate pH given ion concentration
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How do you calculate pH given ion concentration

[From: ] [author: ] [Date: 11-05-12] [Hit: ]
do the same thing!The answer I got for B was a pH of 3.......
I need step by step directions im so confused!!!
A. [OH-]= 1.0•10^-2 M
B. [OH-]= 1.0•10^-11 M

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pH is the negative log of the concentration of the H+ ion.

Because you are given the concentrations of the OH- ion, you must find the pOH.

pH = 14 - pOH

So, take the negative log of your OH- concentration in part A.

-log(1.0*10^-2) = 2 (that is your pOH, NOT YOUR pH!)

To make it a pH, subtract your pOH value from 14. 14-2 = 12. Your pH is 12.

For part B, do the same thing!

The answer I got for B was a pH of 3.
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