You are a quality control inspector for a nutritional products manufacturer. In
ID: 507818 • Letter: Y
Question
You are a quality control inspector for a nutritional products manufacturer. In the course of your job, you randomly select one sample of vitamin C tablets about to be shipped to your distributor. The bottle indicates that each tablet contains 500, mg of Vitamin C, also known as ascorbic acid. (H_2 C_5 H_ O_ K_a1 = 7.9 times 10^-5, K_a2 = 1.6 times 10^-12 a) Your laboratory technician dissolves one tablet in approximately 6 oz of hot water, to a final volume of 200. mL and titrates this solution with 0.100 M calcium hydroxide. She reports to you the volumes of base added to the beaker were as follows For each of those points in the titration, what pH would you expect to be measured, if the vitamin C tablets are indeed correctly labeled?Explanation / Answer
Ca(OH)2 Ca2+ + 2OH-
[OH-] = 2 x molar solubility of Ca(OH)2
P OH = - log [OH-]
= 2 x 0.1M
-log(.2) =.699
PH = 14-.699
=13.3
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