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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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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- 1a. Use the given table to construct a temperature-composition diagram for cyclohexane Toluene mixture. Based on the plot, what is the composition of the distillate obtained by Simple distillation 20 mole percent cyclohexene and 80 mole percent toluene? Show your Work on the plot. 1b. Estimate the composition of the distillate of 20 mole percent of cyclohexane if the Distillation column had three theoretical plates.Answer the questions below. a) 500 ml. Acetic acid in 200 mL acetic acid-water mixture containing 30% acetic acid by volume with pure isopropyl ether will be separated by LIQUID-LIQUID extraction. Assuming the dispersion coefficient of acetic acid in isopropyl ether+water carjumine is 2, calculate the amount of acetic acid that passes into the organic phase and the extraction yield. b) What are the desired properties of the solvents used in liquid-liquid extraction processes?The liquid-liquid extraction is the classical technique in chemistry to isolate a target component from a mixture. Organic Solvent is the usual solvent being used along with water. TRUE or FALSE
- Which statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.A three-component mixture containing compounds A, B, and C is separated by simple distillation. A fraction from that distillation is collected and analyzed by gas chromatography. The resulting chromatogram is overlaid on a ruler in the figure shown below. Using this figure and the data contained therein, determine the percentage composition of each component in this fraction by the triangulation method (i.e. determine the percentages of A, B, and C in this fraction). Be sure to show the setup for your calculations. 15 10 AAA 5. B 10 15 20 25 30 35 (both axes are in mm)please help me find the average and standard deviation
- Assume the data below was collected for two different sample solutions using the same experimental procedure you carried out. Based on the two lines shown below, which solution (orange data points or blue data points) corresponds to the sample with the higher molar absorptivity? 0.9 y4.771 - 0.0728 0.7 0.6 04 0.3 02 y1414 - 0.0546 R0.99642 0.1 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 02 0.1 [Concentration, M] orange data points (lower line) O blue data points (upper line) AbsorbanceBased on the data represented in the temperature vs volume plots, was the simple distillation or the fractional distillation more effective for separating the mixture of 2-Butanone and toluene.Explain how the data in the graph supports your answer10g coffee 4g sodium carbonate 40m dichloromethane 160ml distilled water coffee filter What are the principles behind caffeine being extracted from coffee using the above items? 1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and allowed to dry resulting in 30mg caffeine.
- Will the melting point increase or decrease with the benzoic acid, 4-chloroanaline, and naphthalene if : -You do not remove all of the HCl from the first extraction (mixture) -You forget to do the NaOH extraction (aq layer) -You do not rotovap all of the solvent in the final step (organic layer)You are attempting to purify a compound via recrystallization. You prepare the process through the following method: 1) Dissolve the material in a minimal amount of hot EtOH. 2) Slowly add hot water until the compound is slightly cloudy. 3) Add a small amount of EtOH until the solution is just clear (still hot). 4) Cool to RT. Upon cooling to RT you notice that the compound is not precipitating out of solution. You decide to boil off some ethanol. Upon completing this step and cooling to RT you notice that the compound is precipitating out as desired! In which solvent is your compound the least soluble? Ethanol O Water O The ethanol water mixture Insoluble in all of these solventsPreparation of 3% (vol/vol) Alcohol Solution