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(4.) The flask shown here contains 0.636 g of acid and a few drops of phenolphthalein...

(4.) The flask shown here contains 0.636 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret contains 0.240 M NaOH. What volume of base is needed to reach the end point of the titration? Assuming the acid is monoprotic, what is its molar mass? (5.) 20.00 mL of a H2SO4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 39.09 mL of a 0.1315 M NaOH solution. What is the concentration of the H2SO4 solution?

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