I'm working on an Organic Chemistry lab for recrystallization. I recorded the range of temperature of the mixture being dissolved from beginning to end. I also have the melting range from the MEL-TEMP melting point apparatus. Can you explain to me what the melting point depression and range is?
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- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. Will the aqueous layer be the upper layer or the lower layer? If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?As a newly appointed research officer, Marissa has been assigned a task to separate a mixture containing acetone, acetamide and 1,2-dichloroethane using a high-performance liquid chromatography (HPLC) technique. The instrument was equipped with a 40-cm column packed with cyano propyl bonded to the siloxane backbone material. i) List THREE (3) examples of mobile phase solvent/solvent systems that can be used with the column above. ii) Determine the sequence in which the three analytes eluted from the column and explain the underlying principle applied. iii) Sketch the chromatogram that would be produced if the column was replaced with a column filled with C18 hydrocarbon bound to the siloxane backbone material and acetonitrile was employed as the mobile phase. Label the peaks observed.separate a mixture containing acetone, acetamide and 1,2-dichloroethane using a high- performance liquid chromatography (HPLC) technique. The instrument was equipped with a 40-cm column packed with cyano propyl bonded to the siloxane backbone material. i) List THREE (3) examples of mobile phase solvent/solvent systems that can be used with the column above. ii) Determine the sequence in which the three analytes eluted from the column and explain the underlying principle applied. iii) Sketch the chromatogram that would be produced if the column was replaced with a column filled with C18 hydrocarbon bound to the siloxane backbone material and acetonitrile was employed as the mobile phase. Label the peaks observed.
- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. a. Will the aqueous layer be the upper layer or the lower layer? b. If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?Which of the following could DECREASE the amount of the recovered crystals in the purification by recrystallization experiment? Collecting the recrystallized benzoic acid by filtration using a pre-weighed filter paper. Using a long-stemmed funnel in the hot filtration step. Cooling the filtered solution rapidly. Washing the recovered crystals using hot solvent. a. II, III b. II, IV c. II, III, IV d. I, II, III, IVDescribe briefly how liquid-liquid extraction can be used to separate (not necessarily 100% separation) an analyte, A, from a potential inference, B in a liquid sample. What must be the most important difference between A and B for the separation to succeed?
- 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 0C but that a small amount remained unmelted even at temperatures above 200 0C. Explain this behavior.Make a results and discussion in Laboratory Report Format of the following: 1. Separation of mixture using different techniques 1.1 Simple distillation: Water + acetone 1.2 Fractional Distillation: Methanol + ethanol 1.3 Chromatography: Separation of mixture of Red ink and blue ink 2. purification of impure samples by crystallization 2.1 Copper sulfate 2.2 Potash alum 2.3 Benzoic acidpresent an experimental design on the separation of components of the mixture of benzoic acid and benzaldehyde. Provide a paragrap of your designed experiment and a schematic diagram of the step-by-step procedure
- Briefly discuss how to identify the unknown compound by using mixed melting point method.After the liquid-liquid extraction of caffeine, you are removing the dichloromethane solvent on the rotary evaporator. After 30 mins the solvent volume has not decreased. This may be because: a. You have the aqueous layer on the rotary evaporator and are trying to remove water, instead of the organic layer b. You picked up the wrong solvent bottle, and this isn’t dichloromethane c. It typically takes 30 mins to remove the low-boiling dichloromethane solvent on a rotary evaporator d. You forget to close the vent on the rotary evaporator e. Either a), b), or d).1. 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?