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 condenser II. Not discarding the first milliliter distilled III. Addition of boiling chips into the mixture IV. Maintaining the temperature of the hot plate above 100°C

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 condenser II. Not discarding the first milliliter distilled III. Addition of boiling chips into the mixture IV. Maintaining the temperature of the hot plate above 100°C

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

See similar textbooks

Similar questions

A K2SO4 solution is prepared by weighing out a certain amount of the pure solid reagent,dissolving it to 500.0 mL in a volumetric flask. An aliquot was taken from this solution.of 25.00 ml and diluted to 500.0 ml. An aliquot of 5.00 was taken from this new solution anddiluted to 50.00 ml. A chemical analysis of this new solution showed a 0.100%(w/v)in K+. Calculate the weight of the pure solid K2SO4 used for the preparation of the original solution.and its concentration in each volumetric flask. The answer is 2.23x10^2g
List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillation
You were given a mixture of two miscible solvent A and B that you are tasked to separate. You know that solvent A has a boiling point of 49 oC while solvent B has a boiling point of 174 oC. Which of the listed method would overall be the most efficient? Fractional distillation Recrystallization Solid-liquid extraction Liquid-liquid extraction Simple distillation Acid-Base extraction
1,4‐Dimethoxybenzene (0.642 g) was dissolved in 2.0 mL acetic acid in a 25 mL Erlenmeyer flask using heat from a hot plate. Once the solid dissolved, 1.0 mL tert‐ butanol was added, and the reaction mixture was cooled in an ice bath. Then 2.0 mL concentrated sulfuric acid was added in 2‐3 drop portions,stirring the mixture after each aliquot. After the addition, the flask was removed from the ice bath and allowed to sit at room temperature for 15 minutes. Then 1.0 mL water was added dropwise to dilute the acid and the reaction mixture was added to 40 mL cold water in a 100 mL beaker. The solid was vacuum filtered and washed with 5 mL cold water, giving 52 g filtrate. The product wasrecrystallized from 4.5 mL methanol, yielding 0.317 g purified 1,4‐di‐tert‐butyl‐2,5‐dimethoxy benzene (27.2% yield). What is the atom economy, e-factor, and effective mass yield?
Compare simple and fractional distillation for the separation of HEXANE and TOLUENE
Temperature - distillate volume plot for fractional distillation of benzene (b. pt. 80°C) and toluene (b. pt. 110°C ) The area where benzene is being distilled from the mixture. O a. FR1 b. cannot be determined. c. FR2 d. FR3
The liquid-liquid extraction is the classical technique in chemistry to isolate a target component from a mixture. Organic Solvent is the usual solvent being used along with water. TRUE or FALSE
Students were tasked to conduct a recrystallization experiment to test the ability of the newly discovered solvents in their laboratory to purify and separate a mixture containing compounds X and Y. The solubility of the two compounds in g/50 mL of hot and cold solvents are given by the photo.
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.
"Consider a crystallization of sulfanilamide in which 10 mL of hot 95% ethyl alcohol is added to 0.10 g of impure sulfanilamide. After the solid has dissolved, the solu-tion is cooled to room temperature and then placed in an ice-water bath. No crys-tals form, even after scratching with a glass rod. Explain why this crystallization failed. What would you have to do at this point to make the crystallization work? You should assume that starting over again with a new sample is not an option. (You may need to refer to Technique 11, Figure 11.2.)2.Benzyl alcohol (bp 205°C) was selected by a stu"
Temperature - distillate volume plot for fractional distillation of benzene (b. pt. 80°C) and toluene (b. pt. 110°C ) The area where toluene is being distilled from the mixture. a. cannot be determined. b. FR1 c. FR3 d. FR2
1. What characteristics must a substance possess for it to be separated from a heterogeneous mixture by steam distillation? 2. Explain the role of steam in facilitating the distillation of essential oils. 3. Compare and contrast simple and steam distillation in terms of the type of mixtures separated by each technique. 4. What is/are the difference(s) between a simple distillation and steam distillation?