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Analogy to the Vinegar Analysis We analyze a vitamin C tablet for ascorbic acid, a weak...

Analogy to the Vinegar Analysis We analyze a vitamin C tablet for ascorbic acid, a weak acid with a molar mass of 176.13 g/mole. Once crushed and dissolved in water, it titrates to a nice phenolphthalein/peach-colored endpoint in a 1:1 reaction with sodium hydroxide. A single tablet of 0.607 g is titrated to endpoint against 0.1120 M sodium hydroxide solution. The initial volume of sodium hydroxide titrant is 0.34 mL, and at endpoint the volume is 26.38 mL. Use this information to answer the following questions. 1. Determine the number of moles of sodium hydroxide dispensed. 2. Determine the number of moles of ascorbic acid (vitamin C) present in the tablet. 3. Determine the number of grams of ascorbic acid in the tablet. Is the manufacturer honest when it reports there are 500 mg per tablet? 4. Determine the percent by mass of ascorbic acid in the tablet. 5. Why do you rinse the clean buret several times with a small amount of titrant solution before starting the experiment?

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