Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Question
Chapter 7, Problem 2Q
Interpretation Introduction
Interpretation:
Reason behind the removal of the stopper from a separatory funnel when liquid is being drained from it should be explained.
Concept introduction:
For daily laboratory liquid-liquid extraction, a separatory funnel is used. Two immiscible solvents can be readily separated by using the extraction technique.
Generally, one of the phases is organic, while the other is aqueous. The mixture of solvents that need to be extracted is poured from the top while stopcock at the bottom is still attached. Funnel is closed using a stopper,and two of the solvents are shaken together. Afterward funnel is inverted. The stopper is removed, and after the separation of layers, liquids are taken out in separate glassware.
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Chapter 7 Solutions
Macroscale and Microscale Organic Experiments
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Similar questions
- Filter paper is usually a poor material on which to powder a solid sample before introducing it into a capillary melting-point tube because small particles of paper may end up in the tube along with the sample. Why is this undesirable? and how might the presence of paper in the sample make the melting-point determination difficultarrow_forwardIn liquid, extraction, why is it necessary to turn the separatory funnel upside down and to open the stopcock?arrow_forward1. Why is the washing of crystals on the filter paper not as effective a process of purification as crystallization?2. How do you account for the formation of crystals of different sizes in slow and rapid crystallization process?3. What properties should ideally be possessed by a recrystallization solvent?arrow_forward
- 1. Why does the solid need to be finely ground and then tightly packed in a melting point capillary tube?arrow_forwardWhat effect does the presence of impurity have on the melting point? Can the amount of impurity be quantified by melting point determination?arrow_forwardBRIEFLY explain why steam distillation can be used to purify or isolate temperature-sensitive materials.arrow_forward
- What are the different melting point apparatus that are available for routine analysis? Describe each.arrow_forward1. Why should the stopper always be removed from a separatory funnel whenever a liquid is being drained through the stopcock?2. The distribution coefficient, KD (ether/water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether? Calculate the weight of aspirin which would be removed by three extractions with 20 ml portions of water.arrow_forwardHow will the calculated molarity of the solution be affected if solid particles splatter out of the flask during the drying process? Explain. How will the calculated molarity be affected if the solute residue is not dried thoroughly? Explain.arrow_forward
- Why should the recrystallization mixture be cooled in an ice bath prior to filtering?arrow_forwardExplain fundamentally how the use of a column packing material (copper sponge, glass beads, etc.) increases the efficiency of a fractional distillation column.arrow_forwardwhy is it necessary to turn the separatory funnel upside down and to open the stopcock?arrow_forward
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