Contrast the physical appearance of the crude material before the recrystallization and that of the material isolated after recrystallization.
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A: To find the reason for varied retention times and intensities
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A: In vacuum filtration, the filter paper should be wet before the final product solution is poured…
Q: Why should the recrystallization solvent have a fairly low boiling point?
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Q: If you are extracting a substance from water into ether, is it more effective to do one extraction…
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Q: Which of the following solvent systems are not suitable for binary solvent recrystallization?
A: a) water and heptane
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Q: 5. Discuss how melting points of the impure sample and recrystallized sample could have been used to…
A: Melting point is the temperature at which there is a change from the solid to the liquid state i.e.…
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A: The loss of water happening during the inital heating or during the second heating is not relevant
Q: What is each cycle of a simple distillation called? Theoretical plate Distillate…
A: Simple distillation is process of separation.
Q: Organic and aqueous phases are separated from each other during extraction based on:
A: In the separating funnel, the aqueous layer is on the bottom, meaning the organic layer must be less…
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A: Dispersed Phase: The phase or particles which are present in the form of colloidal particles is…
Q: Why is the final product from recrystallization isolated by vacuum filtration and not by gravity…
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Q: Why is steam distillation and not fraction distillation used to extract limonene from citrus peels.
A: Steam distillation: It is a purifying technique which includes distilling of water with volatile and…
Q: You measured the melting point of the recrystallized product Ttal=142,2-145,5°C. Based on this…
A: Given that, Melting point of recrystallized product = 142.2℃ to 145.5℃ .
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A: Recrystallization is the process by which non volatile organic solids are purified. In this method…
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A: Given : We have to tell whether the statement is true or false.
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Q: What should be done if the percent recovery is greater than 100%? Should the recrystallization…
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Q: Briefly describe on how peptization may occur during washing process of pure compound
A: Peptisation is the process of converting a precipitate into colliodal particles by adding an…
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Q: Why is it necessary to allow enough time for your samples to dry?
A: during the organic synthesis, product may contain the impurity due the presence of the solvent
Q: What are emulsions? Why do they form during extractions? How is their formation minimized?
A: Emulsion is defined as the dispersion of one liquid in another liquid which are not miscible or it…
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A: A question based on analytical process that is to be accomplished.
Q: Imagine you are an organic chemistry student who isolates a crude sample of salicylic acid following…
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Q: Choose the separation techniques that rely on differences in boiling points. A. Simple distillation…
A: To identify: The techniques which use the difference in boiling point for separation.
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A: Liquid-liquid extraction is also called solvent extraction is a method of separating compound from…
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A: Mobile phase: It is the phase that is getting movement in the column. The sample that has to be…
Q: 1.What is the purpose of washing the recrystallized solid with solvent during the vacuum filtration…
A: A question based on purification, which is to be accomplished.
Q: We want to extract terpenoids from an aqueous sample by continuous liquid-liquid extraction. Which…
A: The solution is given below -
Q: Why should the washing solvent be cold in the suction filtration step?
A: Suction filtration is the final step for separating the compound from the solution during the…
Q: A student recrystallized some impure benzoic acid and isolated it by filtration. He scraped the…
A: Recrystallization can be defined as the process in which old arrangement of particles in the crystal…
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A: It is observed that a light tan solution is obtained and because of this, it is better to filter it…
Q: Compare the simple distillation of pure hexane and binary mixture of hexane and toluene to that of a…
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Q: How to get maximum % recovery from recrystallization and crude weight
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Q: What properties should ideally be possessed by a recrystallization solvent?
A:
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Q: All are properties of ideal solvent for recrystallization except: • Dissolves the sample when hot •…
A:
Q: why do we have to order samples (from least concentrated -most concentrated) when measuring the…
A: A question based on qualitative analysis, which is to be accomplished.
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- A 532 mg of a mixture of fluorene and benzoic acid was weighed out and subjected to an extraction and recrystallization. After this purification was completed the product crystals were dried and analyzed. The purification procedure produced 174 mg of fluorene and 249 mg of benzoic acid. Calculate the percent composition of this mixture.Why is recrystallization not applicable to samples which contain large amount of impurities?You are attempting to purify a compound via recrystallization. You prepare the process through the following method: 1) Dissolve the material in a minimal amount of hot EtOH. 2) Slowly add hot water until the compound is slightly cloudy. 3) Add a small amount of EtOH until the solution is just clear (still hot). 4) Cool to RT. Upon cooling to RT you notice that the compound is not precipitating out of solution. You decide to boil off some ethanol. Upon completing this step and cooling to RT you notice that the compound is precipitating out as desired! In which solvent is your compound the least soluble? Ethanol O Water O The ethanol water mixture Insoluble in all of these solvents
- Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.What are the differences between a simple distillation and steam distillation?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.
- Q1. Give three criteria for a good recrystallization solvent. Q2. You want to purify 10 grams of benzoic acid that has been contaminated with 0.2 g of salicylic acid. You are given the following data: Solubility in water at 20 °C Solubility at 100 °C (g/10 ml) Compound (g/10 ml) Benzoic Acid 0.029 0.680 Salicylic Acid 0.680 0.029 0.22 6.67 a) What volume of Boiling water is needed to dissolve the 10 g of benzoic acid? (show calculations) b) How much benzoic acid will crystallize after cooling to 20 °C (show calculations) c) Will any salicylic acid crystals form? Why or why not? (show calculations/ reason for answer) d) What is the maximum amount of benzoic acid that could be recovered in the first crop of this recrystallization? (Show calculations) e) How can you prove the purity and identity of the purified Benzoic acid?Which of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.Compare simple and fractional distillation for the separation of HEXANE and TOLUENE