What is the molar mass of the unknown acid? b as the acid, Ask an Expert

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A) A solution is made by dissolving 0.4000g of an unknown monoprotic acid in enough water to make a total of 100.0mL. This solution was titrated with 0.0777M NaOH, and it required 55.29mL of the NaOH to reach the end point. What is the molar mass of the unknown acid? B) As the acid is titrated, the pH of the solution after the addition of 15.00mL of the base is 9.46. What is the Ka for the acid?

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