In lab 7, a back titration was performed to determine the milligrams of CaCO, in an antiacid tablet. If it was found that 0.01031 moles of HCI were consumed by the tablet and 0.0120 moles of HCI were initially added to the tablet, how many moles of NaOH were needed to titrate the excess HC? O 0.02231 mol O 0.001690 mol 0.003380 mol Not enough information

In lab 7, a back titration was performed to determine the milligrams of CaCO, in an antiacid tablet. If it was found that 0.01031 moles of HCI were consumed by the tablet and 0.0120 moles of HCI were initially added to the tablet, how many moles of NaOH were needed to titrate the excess HC? O 0.02231 mol O 0.001690 mol 0.003380 mol Not enough information

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?
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