Extraction of Caffeine Are you completing this experiment online? Yes Data Collection Mass of 2 Vivarin tablets (g) 0.602 Mass of crude caffeine (g) 0.596 Mass of recrystallized caffeine (g) 0.555 Calculations Percent isolation of caffeine (%)

Extraction of Caffeine Are you completing this experiment online? Yes Data Collection Mass of 2 Vivarin tablets (g) 0.602 Mass of crude caffeine (g) 0.596 Mass of recrystallized caffeine (g) 0.555 Calculations Percent isolation of caffeine (%)

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter5: Distillation

Section: Chapter Questions

Problem 11Q

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1.Which of the following correlations about the analyses of iodine and saponificationnumbers is/are incorrect?a. Alcoholic KOH: dissolve KOH to lipid sampleb. Hanus reagent: react with saturated lipid bondc. Reflux set-up: hasten reactiond. Blank titration: determine total mol of KOH2. A triacylglycerol (Sample X) was subjected to saponification analysis. 1.1 grams of thesample was refluxed with 5% alcoholic KOH and the refluxed solution was titrated with 17.2 mLof 0.44 M HCl titrant. The blank solution was titrated with 25.6 mL of the titrant.i. What is the saponification number of the sample? ii. Which of the following could be the identity of the sample? Show solutions pls a. Tripalmitin (MW: 807.3)b. Trilaurin (MW: 639.8)c. Triolein (MW: 885:4)d. Tristearin (MW: 891.48)
A saturated Na₂CO₃ solution isprepared, and a small excess of solid ispresent (white pile in beaker). A seedcrystal of Na₂ ¹⁴CO₃(¹⁴C is a radioac-tive isotope of ¹²C) is added (small redpiece), and the radioactivity is mea-sured over time. (a) Would you expectradioactivity in the solution? Explain.(b) Would you expect radioactivity inall the solid or just in the seed crystal? Explain.
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COCI (9) CO (9) 1(12 (9 160 °C Ke 2. 19 X 10 Predict the direction the vxn pYO ceedr ToWNard fquilibrum for the following mixture: [COCla7= 0.0100 M [C0]= [C11]1.48 x 100m
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(c) What is the minimum distribution ratio that permits removal of 99% of a solute from 50.0 mL of water with (i) two 20.0-mL extractions with an organic solvent; (ii) four 10.0-mL extractions with the organic solvent?
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(14) The Ksp of PbCl2 is 1.6 x10-5 at 25°C. What is the concentration of Pb2+ (in M) in an aqueous solution initially containing 0.13 M Na+ and 0.13 M Cl- and now saturated with PbCl2?
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