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what observation can you make for the solutions after mixing them with the vortex?
a.The bromine solution turned transparent when mixed with hex-1-ene
b. There are no differences between the tubes
c. The bromine solution turned transparent when mixed with pentane
d. Both solutions turned transparent
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- Explain and elaborate how the following purification techniques work: a. Sublimation b. Recrystallization1. 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?At what step in the recrystallization process would a colored impurity be removed?
- a) What percent of X can be extracted with 100 mL hexane? b) What will be the percent X remaining in water after extraction with four batches of 25 mL hexane? c) Using 100 mL water sample and portions of 25 mL hexane, determine the minimum number of extractions to obtain an efficiency of approximately 99 % Show solution and explanation.1. Why does the solid need to be finely ground and then tightly packed in a melting point capillary tube?Why would a solvent with a very high boiling point be inappropriate for a recrystallization? Too much solvent would be lost to evaporation during the heating phase of the recrystallization Impurities and the compound to be recrystallized would dissolve equally well in this solvent A high boiling solvent would not dissolve the compound to be recrystallized It would be difficult to remove residual solvent from the purified crystals
- 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 containerDraw 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)The key to a successful HPLC procedure is good sample separation which is represented by a clean peak for each individual compound. What should we do to ensure a good sample preparation? A. Use a column and a mobile phase with different polarity B. Use a column and a mobile phase with the same polarity C. Use a lower temperature higher than the mobile phase boiling point D. All of those
- We used a 0.5 M sucrose solution for homogenization of the spinach samples. What would have been a possible effect is a 0.05M sucrose solution had been used?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)A student recrystallized some impure benzoic acid and isolated it by filtration. He scraped the purified benzoic acid off the filter paper after it had dried and took the melting point as a test for purity. He was surprised that most of the white solid melted sharply between 121 and 122 °C but that a small amount remained unmelted even at temperatures above 200 °C. Explain this behavior.
