Chemistry - Quick question about standard reductions of half-cells

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Adding acid to a solution alters the conditions under which standard reduction potentials are calculated, specifically regarding the use of the H2 half-reaction. When acid is present, the H2 half-reaction is not applicable, while it remains relevant when a base is added. This distinction is crucial for accurate electrochemical calculations. Clarification on the specific reaction in question is necessary for a more detailed discussion. Understanding the impact of pH on half-cell reactions is essential for proper application in chemistry.
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my teacher says that if you add acid to the solution then you don't use the H2) half reaction with the (10-7 M), but that you still do if you add a base. Is this true?
 
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I don't even know what you're question is... could you please specify what reaction or what is it that youre doing?
 
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