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A 5.65 −g sample of a weak acid with Ka=1.3×10−4 was combined with 4.80 mL of...

A 5.65 −g sample of a weak acid with Ka=1.3×10−4 was combined with 4.80 mL of 6.10 M NaOH and the resulting solution was diluted to 750 mL. The measured pH of the solution was 4.15. What is the molar mass of the weak acid?

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