A 5.00 ml sample of filtered orange juice was treated with 50.00 mL of 0.01019 M I3 to oxidize ascorbic acid to dehydroascorbic acid. After the oxidation was complete, excess 13- was back- titrated with 13.96 ml of 0.07125 M Nazs203 to starch indicator endpoint. What is the concentration of ascorbic acid (MM = 176.12) in the orange juice? Report the concentration ascorbic acid in mg/100mL. C6H8O6 + 13 - C6H6O6 + 31" + 2H* 13 + 282032 - S406?- + 312

A 5.00 ml sample of filtered orange juice was treated with 50.00 mL of 0.01019 M I3 to oxidize ascorbic acid to dehydroascorbic acid. After the oxidation was complete, excess 13- was back- titrated with 13.96 ml of 0.07125 M Nazs203 to starch indicator endpoint. What is the concentration of ascorbic acid (MM = 176.12) in the orange juice? Report the concentration ascorbic acid in mg/100mL. C6H8O6 + 13 - C6H6O6 + 31" + 2H* 13 + 282032 - S406?- + 312

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter7: Extraction

Section: Chapter Questions

Problem 1Q

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A 5.00 mL sample of filtered orange juice was treated with 50.00 mL of 0.01019 M I3– to oxidize ascorbic acid to dehydroascorbic acid. After the oxidation was complete, excess I3– was back- titrated with 13.96 mL of 0.07125 M Na2S2O3 to starch indicator endpoint. What is the concentration of ascorbic acid (MM = 176.12) in the orange juice? Report the concentration ascorbic acid in mg/100mL. C6H8O6 + I3– → C6H6O6 + 3I- + 2H+ I3– + 2S2O32- → S4O62- + 3I2 42.89 % 40.85 % 27.34 % 82.51 %
The amount of ascorbicacid ,in aorange juice was determined by oxidzing the ascorbic acid to dehydroascorbic acid , with a known excess I3 , and back titrating the excess I3 with na2s3o4. A 5 ml sample of filtered orange juice was treated with 50ml of excess 0.01023mol/l. After the oxidation was complete, 13,72 ml of 0,07203 mol/l na2s204 was needed to reach the starch indicator end point. Report the concentration acid in miligrams per 100ml
4 (Chemical Connections 19F) Why do Lactomer stitches dissolve within 2 to 3 weeks following surgery?
2.1g of sample are dissolved in methylene chloride and the sample is extracted with an aqueous solution of acid and base. Three compounds are isolated - 0.7g of ethyl p-aminobenzoate, 0.6 g of acetanilide, and 0.5 g of benzoic acid. Calculate the % composition of ethyl p-aminobenzoate in the recovered mixture. (Round the answer to 1 significant figure. Give just the number, not a % sign.)
0.2 gm of ethanol was acetylated with acetic anhydride in presence of pyridine (1:3), neutralization of the resulted solution required 20 ml of 0.1 N NaOH, while the blank titration reqiuered 40ml of NaOH. Calculate the percentage of hydroxyl group in this sample ?
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A glycylglycine buffer is made to a pH of 8.45 at 25 ∘C then warmed to 37 ∘C. The pH of the solution changes because of the pKa changes. Glycylglycine has a p?a=8.26 and a Δp?a/Δ?=−0.026 °C−1. Calculate the pH of the buffer at 37 ∘C.
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ion) 16-when a drop of starch solution was added to a brown solution of a now Substance (A) it turns dark blue, while when starch solution was Added to orange red solution of substance (B) it turns yellow. 1- The substance (A) is most likely to be? (a) lodine, I2 (b) Chlorine, Cl2 (C) bromine, Br2 a 2- The substance (B) is most likely to be? (a) lodine, I2 (b) Chlorine, Cl2 (C) bromine, Br2
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What is the acid base reaction involved in the titration of liberated HCl (from the reaction of methylethyl ketone and hydroxylamine hydrochloride) and NaOH?