Finding Ka from pH

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205150314
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Joined: Wed Feb 20, 2019 12:16 am

Finding Ka from pH

Postby 205150314 » Sun Jan 26, 2020 9:45 pm

To find Ka/Kb from pH/pOH we would just need to do the inverse log of the the pH/pOH correct?

J_CHEN 4I
Posts: 54
Joined: Tue Nov 14, 2017 3:01 am

Re: Finding Ka from pH

Postby J_CHEN 4I » Sun Jan 26, 2020 9:50 pm

Giving pH or pOH, then [H3O+] = 10^(-pH) and [OH-] = 10^(-pOH).

stephaniekim2K
Posts: 79
Joined: Fri Aug 09, 2019 12:16 am

Re: Finding Ka from pH

Postby stephaniekim2K » Sun Jan 26, 2020 9:51 pm

[H30+]=-logpH and [OH-]=-logpOH.

Hannah Pham
Posts: 104
Joined: Fri Aug 09, 2019 12:17 am

Re: Finding Ka from pH

Postby Hannah Pham » Sun Jan 26, 2020 10:05 pm

If you're given pH or pOH then use [H3O+] = 10^-pH and [OH-] = 10^-pOH to determine concentration, and plug the concentrations into Ka/Kb formula to determine Ka/Kb value.

Niharika 1H
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

Re: Finding Ka from pH

Postby Niharika 1H » Sun Jan 26, 2020 10:43 pm

[H3O+] = 10^(-pH) and [OH-] = 10^(-pOH), and you can plug these values into the equations for Ka and Kb: Ka = ([H+][A-]/[HA])

Ashley Nguyen 2L
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Re: Finding Ka from pH

Postby Ashley Nguyen 2L » Sun Jan 26, 2020 11:23 pm

You know that [H3O+] = 10^-pH and [OH-] = 10^-pOH. You can get the Ka or Kb values from using the [H3O+] and [OH-] respectively.


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