8) A 5000 mg tablet of Vitamin C(ascorbic acid, CaHO pK, -4.17) was titrated wit

Question

8) A 5000 mg tablet of Vitamin C(ascorbic acid, CaHO pK, -4.17) was titrated with 0.150 M NaöH required 15 that no other chemical in the tablet reacts with NaOH) .55 ml to reach a phenolphthalein endpoint. what is the % purity of the Vitamin C tablet, (As ferring to question W8, how much Na Ascorbate would have to be added to the tablet to produce a solution of pH-7.35 in 2.OL of solution? 9) Re 10.) Arrange the conjugate bases of the following acids in order of increasing basicity. HCN, acetic acid, hypochlorous acid, Hydrochloric acid, Ammonium Chloride. lv HC10 Copynight Cengage Leaming Powered by Cognero HCl CIHyN

Explanation / Answer

Question 8

Balanced equation:
HC6H7O6(aq) + NaOH(aq) =====> H2O(l) + NaC6H7O6(aq)
Reaction type: double replacement

Moles of NaOH used = 0.15 x 15.55 /1000 = 0.0023325 Moles

Moles of ascorbic acid present = 0.0023325 Moles

Mass of ascorbic acid = 0.0023325 x 176.12 = 0.410 gm

Percentage purity of the sample = 0.41 x 100 % / 0.5 = 82.15 %

Ascorbic acid possess 82.15 % purity

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