### pH and pOH

Posted:

**Sun Jan 19, 2020 7:16 pm**If one has the concentration of one or the other, can the other half be found (for example, I know the pH, but with that information can I determine the pOH?)?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=51&t=56695

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Posted: **Sun Jan 19, 2020 7:16 pm**

If one has the concentration of one or the other, can the other half be found (for example, I know the pH, but with that information can I determine the pOH?)?

Posted: **Sun Jan 19, 2020 7:18 pm**

Yes, pH+pOH =14, so this can be used to determine the other if you have either the pH or the pOH.

Posted: **Sun Jan 19, 2020 7:18 pm**

If you know the pH, for example pH = 6, then according to the equation pH + pOH = 14 (derived from pKw = pH + pOH) then you would just set pOH = 14 - pH (6) so your pOH would equal 8.

Posted: **Sun Jan 19, 2020 7:19 pm**

Yes, pOH + pH = 14 so you can just do a little algebra to rearrange that equation to solve for what you're looking for.

Posted: **Sun Jan 19, 2020 7:21 pm**

yes! pOH + pH = 14 so you can. just subtract 14 from whichever. concentration you have and you have the other one as well

Posted: **Sun Jan 19, 2020 7:23 pm**

Yes. Since pH + pOH = 14, you can find either one as long as you have the other.