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How to define the PH value for my species ????

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Old   July 20, 2006, 02:38
Default How to define the PH value for my species ????
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Luke
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HI~~

My electrolysis reactions are below:

Cathode: 2OH- --> 0.5 O2 + H2O

Anode: 2H2O ---> H2 + 2OH-

Initially, there are H2O + OH- in my solution. The problem is that how can I define the PH of the OH- in the solution? Or it can be translated by another form like mass or another. Can somebody help me~ Thank you.
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Old   July 25, 2006, 05:24
Default Re: How to define the PH value for my species ????
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Anon
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pH is a derived quantity based on CONCENTRATION!
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Old   July 25, 2006, 09:18
Default Re: How to define the PH value for my species ????
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Luke
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Thank you for your reply~

I know PH means concentration. But how can I define the concentration for my specifed species?

Can you get me some examples?

Thank you.
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Old   July 27, 2006, 03:37
Default Re: How to define the PH value for my species ????
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Anon
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I hope I understand you properly. I just told you to convert pH into concentration by using its definition. pH=log_10(1/[H]) where [H] is concentration of H ions.

As far as concentration definition in Fluent is considered, you define it in terms of mass fraction.
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