# B convert the t to abs and fill in answers in the

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Chapter 42 / Exercise 17
Physics for Scientists and Engineers with Modern Physics
Jewett/Serway
Expert Verified
b.Convert the %T to Abs and fill in answers in the table above. c.Prepare a graph Abs vs Concentration. d.From the graph, determine the concentration of the unknown solution.
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Chapter 42 / Exercise 17
Physics for Scientists and Engineers with Modern Physics
Jewett/Serway
Expert Verified
120 Determining Ascorbic Acid in Vitamin C Tablets PURPOSE: Determine the mass percent of ascorbic acid in a vitamin C tablet by titration with a sodium CHEMICAL EQUATIONS:HC6H7O6(s) + NaOH (aq) NaC6H7O6(aq) + H2O (l) HC6H7O6is the chemical formula for ascorbic acid. MATERIALS:Phenolphthalein (note: flammable and an irritant) NaOH Vitamin C tablet Buret Apparatus BACKGROUND:Ascorbic acid, or vitamin C, is a water-soluble vitamin found in a variety of foods including citrus fruits, tomatoes, and leafy green vegetables. An individual needs for ascorbic acid may vary but the Recommended Daily Allowance (RDA) for adults is 60 milligrams (mg). In this lab we will determine the amount of ascorbic acid in a vitamin C tablet using titration with a NaOH solution. We will compare the results of the titration with the amount of ascorbic acid the manufacture claims to be in the tablet. Example Calculations: Calculate the amount of moles of ascorbic acid in the sample using the known molarity of the standardized NaOH, volume NaOH titrated, and the mole to mole ratio between NaOH and ascorbic acid. ????? ?? ??????𝑖? ??𝑖?= (?????𝑖?? ?? ???𝐻 (?????))(?????? ?? ???𝐻 ?𝑖?????? 𝑖? ?𝑖????) (1 ??? ??????𝑖? ??𝑖?1 ??? ???𝐻)Calculate the mass of ascorbic acid in the sample using the molar mass of ascorbic acid. ???? ?? ??????𝑖? ??𝑖? 𝑖? ?ℎ? ??????, ?= (????? ?? ??????𝑖? ??𝑖?) (????? ???? ?? ??????𝑖? ??𝑖? (????))Calculate the mass percent ascorbic acid in the sample. ???? ???????, % = (???? ?? ??????𝑖? ??𝑖?, ????? ?? ?????? ????, ?) (100%)PROCEDURE:Prepare the Vitamin C Samples 1.Use a mortar and pestle to crush a vitamin C tablet.