VMINTEQ 3.1: How to add OH- species?

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Baho Ilok
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I'm using the free version of VMINTEQ 3.1 and I want to simulate titration with NaOH as the titrant, but I could not find OH- on the list. Can anyone teach me how? Thanks!
 
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I haven't used MINTEQ in ages, but I don't think you can use just OH-, it needs a counterion.
 
Borek said:
I haven't used MINTEQ in ages, but I don't think you can use just OH-, it needs a counterion.
Ah I figured it out! Apparently OH- is represented by a negative value of the H+. But thanks for the reply!