Solution of KIO3 / KI provided Mass of KIO3 = 110.79 g L Volume of solution Approximate Concentration of [KIO3] (based on mass - do not use this in subsequent calculations but make sure standardized KIO3 calculated below is close to this value). = 20.0 Standardization of KIO3 = 0.02589 mol L-1 Purity of ascorbic acid = 99.49% Sample # 1 2 3 Weighed mass of ascorbic acid (g) 0.2138g 0.2033g 0.2014g volume of KIO3 (mL) 16.74mL 14.82mL 14.70mL [KIO3] (mol L-1) %

Solution of KIO3 / KI provided Mass of KIO3 = 110.79 g L Volume of solution Approximate Concentration of [KIO3] (based on mass - do not use this in subsequent calculations but make sure standardized KIO3 calculated below is close to this value). = 20.0 Standardization of KIO3 = 0.02589 mol L-1 Purity of ascorbic acid = 99.49% Sample # 1 2 3 Weighed mass of ascorbic acid (g) 0.2138g 0.2033g 0.2014g volume of KIO3 (mL) 16.74mL 14.82mL 14.70mL [KIO3] (mol L-1) %

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 0.9000-g of KIO3 is dissolved in 500-mL distilled water. A 50.0-mL aliquot portion was run down into an Erlenmeyer flask and 2-g of KI and 2-mL of 6M HCl were added to it. Directly after, the solution was titrated with a 24.80-mL Na2S2O3 solution to a faint yellow solution. Starch TS was added to the resulting solution and the titration with the Na2S2O3 solution continued wherein an additional 1.33-mL was required to bring the blue color of the solution to disappear completely. MW: KIO3 = 214.0 g/mol ; Na2S2O3 = 158.1 g/mol Compute the N of the Na2S2O3 solution. None of the choices 0.09657 N 0.1075 N 0.1017 N
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The separation and purification processes given below and the method used against them are given. Which or which of these pairings are correct? I. Brewing of tea - ExtractionII. Purification of water impurities - ChromatographyIII. Separating olive pomace from olive oil while producing olive oil-DecantationIV.Petroleum fractions obtaining - Ordinary distillationV. Obtaining essential oils and using them in perfume making - Water-steam distillationA. I, II, III, IVB. I, II, III, IV, VC. I, IV, VD. I, II, III, VE. I, II, V
A 0.9134-g of KIO3 is dissolved in 500-mL distilled water. A 50.0-mL aliquot portion was run down into an Erlenmeyer flask and 2-g of KI and 2-mL of 6M HCl were added to it. Directly after, the solution was titrated with a 24.47-mL Na2S2O3 solution to a faint yellow solution. Starch TS was added to the resulting solution and the titration with the Na2S2O3 solution continued wherein an additional 1.33-mL was required to bring the blue color of the solution to disappear completely. MW: KIO3 = 214.0 g/mol ; Na2S2O3 = 158.1 g/mol Compute the M of the Na2S2O3 solution. 0.1047 M None of the choices 0.1107 M 0.09926 M
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