Calculating pH

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Madison Hurst
Posts: 62
Joined: Fri Sep 28, 2018 12:26 am

Calculating pH

Postby Madison Hurst » Mon Dec 03, 2018 12:16 pm

When calculating pH do you only ever use the H3O+ concentration or will you ever use OH-?
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Jerome Mercado 2J
Posts: 60
Joined: Tue Nov 28, 2017 3:02 am

Re: Calculating pH

Postby Jerome Mercado 2J » Mon Dec 03, 2018 12:27 pm

You can easily solve for each other when you have one concentration or the other.

14 = pH + pOH

Unless, you have a weak acid therefore you have to use the Ka concentration.
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Mayaal_Khan_4H
Posts: 41
Joined: Fri Sep 28, 2018 12:28 am

Re: Calculating pH

Postby Mayaal_Khan_4H » Mon Dec 03, 2018 12:34 pm

pH can also be calculated by this formula: pH = -log[H+]
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Irene Zhou 1E
Posts: 73
Joined: Fri Sep 28, 2018 12:18 am

Re: Calculating pH

Postby Irene Zhou 1E » Mon Dec 03, 2018 1:21 pm

I think we will mostly be calculating the pH from the hydronium ion concentration. The pOH can then be calculated by subtracted the pH from 14. With the pOH, we can solve backwards for the concentration of hydroxide ions.
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