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-   -   How to define the PH value for my species ???? (http://www.cfd-online.com/Forums/fluent/41789-how-define-ph-value-my-species.html)

Luke July 20, 2006 02:38

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

Anon July 25, 2006 05:24

Re: How to define the PH value for my species ????
 
pH is a derived quantity based on CONCENTRATION!

Luke July 25, 2006 09:18

Re: How to define the PH value for my species ????
 
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.

Anon July 27, 2006 03:37

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