a)
Interpretation: Effect of removal of solvent at temperatures below their normal points with help of rotary evaporator should be determined.
Concept introduction: Rotary evaporator is laboratory apparatus that is used to remove solvents with help of reduced pressure. This is designed in such way that allows fast evaporation of solvents. A variable-speed motor is used for rotation of flask that has solvent to be evaporated.
b)
Interpretation: Preference of rotary evaporation distillation over simple distillation should be determined.
Concept introduction: Rotary evaporator is laboratory apparatus that is used to remove solvents with help of reduced pressure. This is designed in such way that allows fast evaporation of solvents. A variable-speed motor is used for rotation of flask that has solvent to be evaporated.
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Chapter 4 Solutions
EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
- It is said that the surface area of the boiling liquid should be kept as large as possible. However, why is it that too large of a distilling flask should also be avoided?arrow_forwardIn distillation 1. What is the reason for discouraging the formation of bubbles inside the condenser?2. What is a fractionating column?3. How fractional distillation works?4. What are azeotropes?arrow_forward1. Aspirin could be recrystallized by dissolving in ethanol and adding water. Explain the logic for this procedure.arrow_forward
- Using the results from the solubility test table, what can be concluded about the structure/property of each polymer?arrow_forwardChemistry why cant 99% ethanol be obtained from aqueous ethanol by simple distilation? Can it be achieved by adding a fractionation tube (fractionating column)? Why? .arrow_forward6. In a recrystallization, why is it important to dissolve the solute in boiling solvent instead of cold solvent? a. To melt the solute b. To boil the solute c. To use as small amount of solvent to dissolve the solute as possible d. To chemically decompose the impuritiesarrow_forward
- 2. An impure sample of compound D is contaminated with a number of impurities. The sample is to be purified by recrystallization. The solubility properties of three potential solvents are summarized below. Choose the best solvent and explain your answer. Include comments on each of the three solvents. Solubility of D at the boiling point Solubility of D at - 0°C of the solvent Solvent X 0.08g/mL 0.06 g/mL Solvent Y 0.67 g/mL 0.59 g/mL Solvent Z 0.63 g/mL 0.12 g/mLarrow_forwardWhat is the main information you wish to acquire when performing a melting point analysis? A) the percentage of impurities in your sample B) the average size of crystals after the crystallization process C) how much reagent has successfully turned into product D) whether the conversion from reagent to product was successfularrow_forward………… is usually used only to separate liquids whose boiling points differ greatly or to separate liquids from involatile solids or oils. which option is correct?a. distillation b. simple distillation c. fractional distillationd. steam distillation e. vacuum distillationarrow_forward
- CREATE A SCHEMATIC DIAGRAM FOR THIS PROCEDURE: C. Preparation and storage of standard solutions 1. Use the weighed and transferred NaCl powder in procedure B. Dissolve it in about 10 mL distilled water. Use a stirring rod to gently stir the solution until it has been dissolved to an extent. Make sure you will not incur any noise while stirring. 2. When the NaCl powder is partially dissolved, transfer the resulting solution into a 100 mL volumetric flask. Use a stirring rod and funnel. 3. Repeat steps 1 and 2 until no NaCl remains in the beaker and until you are almost at the mark of the volumetric flask. 4. Rinse the last portion of the solution from the stirring rod into the volumetric flask with a stream of water from the wash bottle. Rinse the funnel and remove it. Dilute the solution in the flask using a Pasteur pipette until the bottom of the meniscus is even with the graduation mark. 5. Put a stopper on the volumetric flask. Invert the glassware up and down around five…arrow_forwardJustify the usage of the reagent choices alsoarrow_forward2. When preparing a non-aqueous alcoholic solution that is required to be free of water:a. What solvent is suitable for calibrating the bottle it is prepared or dispensed in?b. What solvent should not be used for calibration?arrow_forward
- Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks ColeChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning