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

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 July 20, 2006, 02:38 How to define the PH value for my species ???? #1 Luke Guest   Posts: n/a 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.

 July 25, 2006, 05:24 Re: How to define the PH value for my species ???? #2 Anon Guest   Posts: n/a pH is a derived quantity based on CONCENTRATION!

 July 25, 2006, 09:18 Re: How to define the PH value for my species ???? #3 Luke Guest   Posts: n/a 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.

 July 27, 2006, 03:37 Re: How to define the PH value for my species ???? #4 Anon Guest   Posts: n/a 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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