The flask shown here contains 0649 g of acid and a few, Ask an Expert

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The flask shown here contains 0.649 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret contains 0.160 M NaOH. The volume of end point titration is 20.5ml. What is the molar mass of the acid (assuming it is diprotic and that the end point corresponds to the second equivalence point)?

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