8. Which is the correct order for a recrystallization procedure? a. solvent selection-dissolving-deposition and collection of crystals-filtration-washing-drying b. solvent selection-dissolving-filtration-deposition and collection of crystals-washing-drying c. solvent selection-dissolving-deposition and collection of crystals-washing-filtration-drying d. solvent selection-dissolving-filtration-washing-deposition and collection of crystals-drying e. solvent selection-filtration-dissolving-deposition and collection of crystals-washing-drying

8. Which is the correct order for a recrystallization procedure? a. solvent selection-dissolving-deposition and collection of crystals-filtration-washing-drying b. solvent selection-dissolving-filtration-deposition and collection of crystals-washing-drying c. solvent selection-dissolving-deposition and collection of crystals-washing-filtration-drying d. solvent selection-dissolving-filtration-washing-deposition and collection of crystals-drying e. solvent selection-filtration-dissolving-deposition and collection of crystals-washing-drying

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 4Q

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Similar questions

The best liquid mixtures for separation by simple distillation need to have boiling points that differ by at least ___________ oC. 10 20 30 40
What are the different melting point apparatus that are available for routine analysis? Describe each.
2. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible? Group of answer choices To minimize the amount of pure solid lost due to its solubility. To minimize the cost of the recrystallization. To reduce the time needed to filter the pure solid from the solvent after recrystallization. To minimize the amount of hazardous materials used.
1. Cite one factor that affects percent yield during recrystalization. 2. Discuss the importance of solvent-solvent partition in separating mixtures.
TRUE OR FALSE: 1. Solids such as naphthalene when heated will pass thru a process called condensation prior to sublimation when being purified. 2.If water and n-propyl alcohol were mixed, the separation of individual components is possible with steam distillation because these two have a wide range of boiling point difference. 3. When an impurity in the synthesized camphor such as sodium chloride is present, the sublimation technique cannot be used to purify the camphor due to the nature of NaCl. 4. Organic solvents such as hexane or ether are an excellent medium to recrystallize an impure benzoic acid 5. In caffeine extraction, it is important that the tannic acid component of coffee be converted to its free acid state to avoid any interference with the extraction of caffeine
Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?
Assuming that pentane and hexane form an ideal solution, A. Calculate the amount of pentane to be added to 65.0 g of hexane to obtain a minimum dG of mixing from mixing those two components. [MM pentane; 72.15, MM hexane; -86.18] B. Calculate the dS of mixing the components of the mixture above.
3.1 Calculate the volume of concentrated (98% v.v) H2SO4 that you will need to prepare 250ml of an 5.4 M H2SO4 solution. Density of 98% v.v H2SO4 = 1.84 g/cm3
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?
A mixture of 20 mL of isoamyl acetate (MW=130.2 g/mol and density= 0.88 g/mL) and 20 mL of methyl benzoate (MW= 136.2 g/mol and density =1.09 g/mL) is distilled. Calculate the mole percent for each component. Use these mole percents and the figure below to answer the following questions.a. What is the initial boiling point of this mixture?b. What is the composition of the vapor in equilibrium with the liquid? Is this composition the same as the composition of the initial condensate from simple distillation?c. Instead of a simple distillation, you decide to use fractional distillation. Assuming two theoretical plates, what is the composition of the first fraction collected?
Assume that your compound recrystallizes equally well from benzyl alcohol and isopropyl alcohol. Which solvent is the better choice for recrystallization? a. Benzyl alcohol because it is miscible with water. b. Isopropyl alcohol is better because it has a much lower boiling point and is easier evaporate off c. A mixed solvent - benzyl alcohol and isopropyl alcohol d. It doesn't matter which one if they work equally in the recrystallization process.
True or false? The stronger the interaction between a component and the stationary phase, the faster the component is moved by the solvent front.