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The Nernst equation uses the concentrations of reactants and products. So if a problem provides you with a pH and you know you need to use the Nernst equation in order to solve the problem, you must first find the concentration of hydronium ions, by evaluating 10^(-pH) and then proceed to plug in that value into the appropriate location in the Nernst equation. Be sure to never plug in the pH directly into the equation.
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