How to calculate the pH of a weak acid given the pKa

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This lightbaord video explains how to calculate the pH of a weak acid (0.1M solution) given the pKa of 7.455.
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Thanks for this. How would you calculate the pH if you only know the %v/v of de solution, no the molarity? For instance what would be the pH of 7.5% acetic acid solution (v/v)?

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