Interpretation:Solvents or mixture of solvents that can be considered for recrystallization of solids A and b should be explained.
Concept introduction:Criteria mentioned below should be used to select solvent for recrystallization.
1. Solvent should be able to dissolve desired compound in itself at high temperatures but insoluble at low temperatures. In short, solvent with favorable temperature coefficient should be used for particular solute.
2. Solvent should be chosen in such way that impurities are either insoluble in it or remain moderately soluble in it at low temperatures.
3. Boiling point of desired solvent should be low so that it gets separated from crystals easily.
4. Boiling point of solvent should be less than melting point of solid under consideration.
5. There should be no reaction between solvent and substance that needs to be purified.
Want to see the full answer?
Check out a sample textbook solutionChapter 3 Solutions
Experimental Organic Chemistry: A Miniscale & Microscale Approach (Cengage Learning Laboratory Series for Organic Chemistry)
- In fractional distillation, liquid can be seen running from the bottom of the distillation column back into the distilling flask. What effect does this returning condensate have on the fractional distillation?arrow_forwardVapor-pressure lowering is a colligative property, as are freezing-point depression and boiling-point elevation. What is a colligative property? Why is the freezing point depressed for a solution as compared to the pure solvent? Why is the boiling point elevated for a solution as compared to the pure solvent? Explain how to calculate T for a freezing-point depression problem or a boiling-point elevation problem. Of the solvents listed in Table 10-5, which would have the largest freezing-point depression for a 0.50 molal solution? Which would have the smallest boiling-point elevation for a 0.50 molal solution? A common application of freezing-point depression and boiling-point elevation experiments is to provide a means to calculate the molar mass of a nonvolatile solute. What data are needed to calculate the molar mass of a nonvolatile solute? Explain how you would manipulate these data to calculate the molar mass of the nonvolatile solute.arrow_forwardWhat is the kinetic property observed in suspension? What is the optical property observed in solutions?arrow_forward
- Describe the ideal condition/set-up for recrystallization of substances. What are the factors to consider? Explain your answer.arrow_forwardBriefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.arrow_forwardAn ideal recrystallization solvent should have a large gradient of solubility along with temperature, has the ability to dissolves the impurities very well and must not chemically react with the product. For each of the three reasons given, give an explanation for why they are a reason that make an ideal recrystallization solvent?arrow_forward
- 6.arrow_forwardIn a mixed solvent system, what is the role of the "poor" solvent? a.to DECREASE the solubility of the solute in the good solvent and saturate the solution b. to INCREASE the solubility of the solute in the good solvent and saturate the solution c. to DECREASE the boiling point of the mixturearrow_forwardDraw a phase diagram showing how the phase boundaries differ for a pure solvent compared with a solution. Give an explanation for the phase diagram.arrow_forward
- We utilise the phrase "like dissolves like" when choosing the correct solvent for the recrystallization technique. Which of the following sentences accurately describes this principle? A. two compounds with the same type and strength of intermolecular forces will likely dissolve in each other B. two substances with the same type of intermolecular forces but of different magnitude are likely to dissolve in each other C. two substances that contain in their structure the same skeleton, but different functional groups are likely to dissolve in each other. D. options B and C E. options A and Barrow_forward5- A chemist is given a nonelectrolyte white powder for analysis. 38.7 g of this substance is dissolved in 100.0 g of water. It is determined that the resulting solution freezes at -4.0°C. Additionally, the elemental composition of the substance is identified and found to be 40.0% C, 6.7% H and 53.3 % O by mass. Find the molecular formula of this unknown white powder using these experimental evidences (Kş of water: 1.86°C/m, C: 12 g/mol, H: 1 g/mol, O: 16 g/mol).arrow_forward6. Calculate the polydispersity of the polymer sample in the colloid solution having 1:2:1 ratio of the number of moles of polymer chains of exact molecular weights 482.00, 2768.00, and 5308.00 g/mol respectively. A. 1.36 В. 1.26 С. 1.10 D. 1.06 Е. 1.03arrow_forward
- Chemistry for Today: General, Organic, and Bioche...ChemistryISBN:9781305960060Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. HansenPublisher:Cengage LearningGeneral Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage Learning
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningPhysical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks Cole