2. If 1.0120 g of potassium iodate were used to make the 500.0 mL solution, what is the molarity of potassium iodate? 3. If 39.98 mL of thiosulfate solution were needed to completely titrate 50.00 mL of potassium iodate from the above solution, what is the concentration of the thiosulfate? 4. How many moles of I3¬ can be generated from 50.00 mL of KIO3 (from question #2)? 5. If 16.11 ml of standardized thiosulfate (from question #3) is reacted with 50.00 mL of KIO3 and a portion of a vitamin C tablet, how many moles of I3 react with the thiosulfate? (Hint: Don't forget the mole ratios.) How many moles of I3¯ are left to react with the vitamin C? moles react with S2032- moles react with Vit. C

2. If 1.0120 g of potassium iodate were used to make the 500.0 mL solution, what is the molarity of potassium iodate? 3. If 39.98 mL of thiosulfate solution were needed to completely titrate 50.00 mL of potassium iodate from the above solution, what is the concentration of the thiosulfate? 4. How many moles of I3¬ can be generated from 50.00 mL of KIO3 (from question #2)? 5. If 16.11 ml of standardized thiosulfate (from question #3) is reacted with 50.00 mL of KIO3 and a portion of a vitamin C tablet, how many moles of I3 react with the thiosulfate? (Hint: Don't forget the mole ratios.) How many moles of I3¯ are left to react with the vitamin C? moles react with S2032- moles react with Vit. C

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter15: Acid-base Equilibria

Section: Chapter Questions

Problem 96AE: One method for determining the purity of aspirin (C9H8O4) is to hydrolyze it with NaOH solution and...

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One method for determining the purity of aspirin (C9H8O4) is to hydrolyze it with NaOH solution and then to titrate the remaining NaOH. The reaction of aspirin with NaOH is as follows: A sample of aspirin with a mass of 1.427 g was boiled in 50.00 mL of 0.500 M NaOH. After the solution was cooled, it took 31.92 mL of 0.289 M HCl to titrate the excess NaOH. Calculate the purity of the aspirin. What indicator should be used for this titration? Why?