How Do You Find Molarity from pH?

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xnonamex0206
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What do you do when the pH is given, but you have to find the molarity?
 
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Molarity of what? pH= -log([H]), pOH= -log([OH]), pH + pOH = 14. The base for the logarithms is 10, and the charge signs were omitted in those equations.
 

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