a)
Interpretation:Effect of unnecessarily large volume of solvent in recrystallization process should be determined.
Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
b)
Interpretation:No use of fresh cold solvent to wash crystals in recrystallization process should be explained.
Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
c)
Interpretation:Use of fresh hot solvent to wash crystals in recrystallization process should be explained.
Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
d)
Interpretation:Effect of use of large quantity of decolorizing carbon should be determined.
Concept introduction:Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
e)
Interpretation: Effect of formation of crystals by solidified mass of oil separated from hot solution should be determined.
Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
f)
Interpretation: Effect of acceleration of crystallization by immediate placement of flask of hot solution in ice-water bath should be determined.
Concept introduction: Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
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EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
- Why is the final product from the crystallization process isolated by vacuum filtration and not by gravity filtration?arrow_forwardWhat are emulsions? Why do they form during extractions? How is the formation of an emulsion minimized?arrow_forwardAt what step in the recrystallization process would a colored impurity be removed?arrow_forward
- In most distillations, the total volume of liquid obtained (distillate + residue) is possible sources of loss in this procedure?arrow_forwardWhich of the three methods, (Use of Separatory Funnel, Decantation or Use of Pasteur Pipette) do you believe is most suitable for transferring large volumes of liquid mixtures and why?arrow_forwardWhat are some reasons why the melting point might be lower than the literature value? (Hint: Assume all solvent was removed from the recovered compounds)arrow_forward
- Coarse Dispersion What will be the results after you reconstitued a cefixime 60 ml a powder for suspension and stand alon for 24 hours Observe the particles that settle at the bottom of the containerarrow_forwardWhat are emulsions? Why do they form during extractions? How is their formation minimized?arrow_forwardDraw a five-step Schematic diagram of the procedure on how to separate pure crystals of CuSO4 , Alum and Benzoic acid. (Draw only 1 schematic diagram for the three samples)arrow_forward
- Draw a FIVE STEP Schematic diagram of the procedure on how to separate pure crystals of CuSO4 , Alum and Benzoic acid. (Draw only ONE schematic diagram for the three samples)arrow_forwardExplain and elaborate how the following purification techniques work: a. Sublimation b. Recrystallizationarrow_forwardBased on the readings and lecture on emulsions, and the procedures for this lab answer the following question. What is the dispersed phase in the simple vinaigrette? Air Oil Water Eggarrow_forward
- EBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENT