The literature value for the melting range of a pure compound is 113-115o C. What is the expected experimental melting range of that recrystallized compound immediately after being isolated from the Buchner funnel before drying completely? Explain.
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- 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.Based on the resulting chromatograms after visualization with iodine vapor, which between the solvent systems WHITE and MIX resulted in a more effective separation of the pigments of the indigo extract? Explain your answer in terms of the solvent that did not effectively separate the components of the root extract.Cis-3-hexene and trans-3-hexene can be separated and analyzed using GC without injecting an equimolar standard to a high accuracy. Explain why that is the case for these two compounds while we had to inject an equimolar solution for our experiment
- WHAT IS THE CHEMICAL RECTION FOR THIS PROCEDURE 5-Amino-2-chlorophenol To a 250 mL Erlenmeyer flask containing a Teflon coated magnetic stirring bar was added 85% sodium hydrosulfite (14.0 g), water (80 mL), and 20% (mass/vol) sodium hydroxide solution (16 mL). The mixture was magnetically stirred until a clear solution was obtained, then solid 2-chloro-5-nitrophenol (2.75 g) is added in one portion. The mixture was stirred at room temperature for 20 minutes then heated to a gentle boil for about two minutes during which time the yellow color of the solution disappeared, indicating complete reduction of the nitro function. The reaction mixture was cooled to room temperature and then placed in an ice-water bath for about 10 minutes. The crude product was collected by vacuum filtration, washed with a small volume of ice water and then used immediately in the next step. 4-chloro-3-hydroxyacetanilide The 5-amino-2-chlorophenol was transferred to a 6 inch test tube and water (8 mL) was…Propose a extraction flowchart capable of seperating this mixture into its pure form1. 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?
- Assuming that either solvent is otherwise acceptable in a given instance, what advantages does ethanol have over 1-octanol as a crystallization solvent? Hexane over pentane? Water over methanol?RECRYSTALLIZATION & DECOLORIZATION (Organic Chemistry) 1. Propose a process or procedure by which the purity of re-crystallized benzoic acid can be proven. 2. If you are to account for the three components of the original mixture, considering that they were separated, in what form or state, and where were they after the whole process?Acetophenone is soluble in diethyl ether, isopropanol, and n-hexane. Identify and justify the most suitable solvent for UV-Vis characterization
- In a distillation of a mixture of acetone (bp. 56°C and dichloromethane bp. 40°C), a fraction averaging 48°C was collected that never exhibited a plateau temperature.Show using temperature as an indicator of purity what the % of acetone is in this fraction.(Hint: this is similar to the question of refractive index in the last assignment)What makes ethyl acetate a suitable or unsuitable solvent? What concerns would you have if you were to run a column using hexanes as the solvent for the whole column? Come up with an appropriate solvent gradient to get the best separation of all three compounds4. In a distillation of a mixture of acetone (bp. 56°C and dichloromethane bp. 40°C), a fraction averaging 48°C was collected that never exhibited a plateau temperature. Show using temperature as an indicator of purity what the % of acetone is in this fraction. (Hint: this is similar to the question of refractive index in the last assignment) Please answer very soon will give rating surely