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If insoluble impurities eg. dust, tissues, filter paper etc were mixed with the sample how will these affect the measured melting point
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- If insoluble impurities, e.g., dust, tissue, filter paper, etc., were mixed with the sample, how would these affect the measured melting point?estimate the composition of these initial samples of distillate using figure 1. Based on the results what conclusion can you draw regarding the relative efficiencies of the two separations?Describe the errors which may cause an observed melting point range of a PURE sample to be: higher than the correct melting point broad in range
- Briefly discuss how to identify the unknown compound by using mixed melting point method.During melting point determination, what does melting point range means? How will you know if the sample is pure or not?Determination of melting point can also be done by heating melting point capillary to the thermometer using “Thiele tube”. Draw a complete Thiele tube melting point apparatus. What effect would poor circulation of the melting point bath liquid have on the observed melting point?
- Show in a detailed manner. 1. Draw and label the set-up for melting point determination using capillary tube. 2. Differentiate melting point and melting point range.DATA Note: Use the videos as references except when data is provided here. Table 1. Selection of Recrystallizing Solvent. Solvents Dissolution at room temperature? (+ or −) Dissolution at elevated temperature? (+ or −) Distilled water - - Acetone + n/a 95% ethanol - + Toluene + n/a Solid sample: Naphthalene Table 2. Mass Measurements. Mass, g Sample solid 0.5021 Empty watch glass 35.7602 Watch glass with recrystallized sample 36.2485 Table 3. Melting Point Determination. Temperature, oC Appearance of Sample in Capillary Tube … Solid 78.4 Solid 79.3 Solid with signs of liquid 79.9 Solid, liquid 80.6 Liquid, solid 81.3 Liquid with signs of solid … Liquid Theoretical Melting Point, oC: 80.2°C (176.4°F) QUESTIONS Which solvent should be used as the recrystallizing solvent? Check if your chosen solvent satisfies all characteristics of a good…Give at least five factors to consider when performing chromatography (paper, thin-layer, liquid, etc.). Consider giving the general factors to consider.
- Filter paper is usually a poor material on which to powder a solid sample before introducing it into a capillary melting-point tube because small particles of paper may end up in the tube along with the sample. Why is this undesirable? and how might the presence of paper in the sample make the melting-point determination difficulta) 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.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 container
