What is the molecular weight of the unknown acid the same, Chemistry

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What is the molecular weight of the unknown acid the same

1. A 0.2088g sample of an unknown monprotic acid requires 22.10 ml of 0.1000 mol/L KOH to reach the end point. What is the molecular weight of the unknown acid? The same acid in #1 is titrated; the pH of the solution after the addition of 22.10 ml of base is 5.02. What is the Ka for the acid?

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