pH to pOH

[KMcFarland_2L]

When given the pH of a solution, to get to the pOH I have been subtracting the pH from 14, and doing the same thing for going from pOH to pH. Is this the right method, and if so, why?

[AnnaNovoselov1G]

Yes, this is correct. This is because the concentration of pH times the concentration of POH must equal to to the equilibrium constant for the ionization of water, which is 1.0 x 10^-14. If you take the log of both sides and simplify, you would get pH + pOH =14.
We use pH and pOH because representing the concentration in whole numbers is easier that always saying the concentration of H= is 2.3 x 10^-6 (which equals pH of 5.6) or something like that.

[Heather Szeszulski 1I]

what is pOH? i am a little confused

[gabbi_r2C]

I agree with the answer above in regards to the original question. pOH is basically pH (ie -log[H+]) but instead of focusing on H+ concentration, we focus on OH- concentration. So pH and pOH are complimentary in that way, and always add up to 14.

[SelenaDahabreh1D]

what is pOH? i am a little confused

pOH is a measure of the concentration of the hydroxide ion [OH-].
Just know that [OH-}*[H+]=1.00*10^-14, and pOH+pH=14.00
Here is a site that explains it in more detail: https://courses.lumenlearning.com/chemi ... h-concept/

[Emma Ide 2E]

Yes, just know that pH+pOH= 14, so you can rearrange the equation depending on what is given.

[OwenSumter_2F]

Also make sure given any of the four components (pH, pOH, OH^- levels, H⁺ levels) that you can get the other three, as seen in the Sapling homework for this week.

[Rob Tsai 2F]

Also make sure given any of the four components (pH, pOH, OH^- levels, H⁺ levels) that you can get the other three, as seen in the Sapling homework for this week.

What do you mean by OH- and H+ levels? I haven't started the homework yet, but I'm assuming this means the concentration of H30+ and OH-? With those values, you would simply plug both into -log base 10 to get pH and pOH, respectively. If I'm wrong, could someone explain how to utilize these two values?

[Ariel Guan 1H]

yea, just know that 14 = pH + pOH. Also, to find [H+] from pH, the equation is [H+] = 10^-pH, and for [OH-], [OH-] = 10^-pOH