What is the purpose of testing distilled water and laboratory ethanol in the testing of ethanol? 2. During the experiment, you recorded the vapor temperature of the samples. Does the literature B.P. of ethanol correspond to the recorded temperatures? Why or why not? 3. Based on the iodoform test, did your distillate portion contain

What is the purpose of testing distilled water and laboratory ethanol in the testing of ethanol? 2. During the experiment, you recorded the vapor temperature of the samples. Does the literature B.P. of ethanol correspond to the recorded temperatures? Why or why not? 3. Based on the iodoform test, did your distillate portion contain

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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1. Explain the importance of using a thermometer in the simple distillation setup. 2. Enumerate the characteristics of a substance for it to be separated from the heterogeneous mixture by steam distillation. 3. How does steam facilitate the distillation of essential oils? 4. Discuss some applications of simple distillation and steam distillation. Explain why you can use each method for the chosen application.
1. Explain the importance of using a thermometer in the simple distillation setup. 2. Enumerate the characteristics of a substance for it to be separated from the heterogeneous mixture by steam distillation. 3. How does steam facilitate the distillation of essential oils? 4. Discuss some applications of simple distillation and steam distillation. Explain why you can use each method for the chosen application. 5. What is the most dominant intermolecular forces of attraction that exist between: a. water and limonene, the major monoterpene component of lemon essential oil? b. water and constituent ions of sodium chloride? 6. Based on your answers in number 5, which pair (water-limonene or water-sodium chloride) exhibits a stronger attraction between their molecules/ions? 7. Describe what happens during the salting-out process in terms of the intermolecular forces of attraction involved as mentioned in your previous answers.
Which of the following could DECREASE the amount of the recovered crystals in the purification by recrystallization experiment? Collecting the recrystallized benzoic acid by filtration using a pre-weighed filter paper. Using a long-stemmed funnel in the hot filtration step. Cooling the filtered solution rapidly. Washing the recovered crystals using hot solvent. a. II, III b. II, IV c. II, III, IV d. I, II, III, IV
Three sample, X (neutral), Y (basic), and Z (acidic), were mixed and dissolved together in dichloromethane. Propose a method to separate all given sample individually using the combination of liquid-liquid extraction, crystallization, distillation, and sublimation technique.
13.) A mixture containing 50% mole of A is distilled at a temperature T, what is the distillate to residue ratio? А. 1.5 B. 0.33 C. 0.67 D. 2.0 E. 0.50 30 50 60 Mole 5k of A
15. In the extraction experiment, we get (obtain) caffeine from a solution of caffeine in dichloromethane by using a) Extraction b) Salting out then adding drying agent c) Direct simple filtration from dichloromethane d) Evaporation of the dichloromethane
Which of the following observations is INCORRECT? a. 4-aminophenol: wine red solution in FeCl3 b. Phenol: white precipitate in Br2 in water c. 3,5-dimethyl-1-hexanol: No layer formation in Lucas reagent d. 3,6-dihydroxycycloheptanone: decolorization of solution in KMnO4 test
A mixture of the two compounds shown below is dissolved in ether. Using the information given in the experiment, select all the correct statements regarding the extraction and isolation of the two compounds. lose 0000 X OH A. X can be extracted from the organic layer using sodium hydroxide. B. Y can precipitate out of the aqueous layer by the addition of sodium hydroxide to the salt of Y. C. X can precipitate out of the aqueous layer by the addition of sodium hydroxide to the salt of X. D. Y can be extracted from the organic layer using sodium hydroxide.
. Which of the following would LOWER the purity of the distillate collected from the rubbing alcohol mixture? SELECT ONE OR MORE: EXPLAIN WHY IT IS INCLUDED I. Using cold water in the condenserII. Not discarding the first milliliter distilledIII. Addition of boiling chips into the mixtureIV. Maintaining the temperature of the hot plate above 100°C
need help in answering 3 & 4
Purification of benzoic acid 1. What is the purpose of washing the crystal in the filter paper with water? 2. How recrystallization affects the theoretical yield of sample? Explain.
IDENTIFICATION OF THE COMPONENTS OF THE MIXTURES. 1. A. Sodium Chloride - naphthalene -'Food Color Mixture 1. Sublimation 2. Adsorption with activated carbon 3. Dissolution with water then evaporation B. Sodium chloride - Sulfur - Sand Mixture 1. Dissolution with water then evaporation 2. Dissolution with toluene then decantation 3. Dissolution with toluene the evaporation