Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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you prepare a standard NaOH solution for the laboratory, using potasium hydrogen phthalate (KHC8H4O4, KHP) as the primary standard. KHP (molar mass= 204.222 g/mol) has one acidic hydrogen. it took 31.55mL of the NaOH to titrate (react exactly with) 0.750g KHP. you then use the standard base solutio to determine the amount of ascorbic acid in a 500.0 mg tablet of vitamin C. Ascorbic acid (HC6H7O6, molar mass 176.12 g/mol) also has one acidic hydrogen, and is usually mixed with some fiber in preparating the tablets. it requires 17.74 mL of the NaH to titrate (reacr exactly with) the ascorbic acid found in one 500.0 mg tablet. what is the percent vitamin C by mass in the tablet?
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