If insoluble impurities, e.g., dust, tissue, filter paper, etc., were mixed with the sample, how would 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?
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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 point1. Why does the solid need to be finely ground and then tightly packed in a melting point capillary tube?Why is it necessary to pulverize the sample in doing the experiment of melting point?
- Why should the recrystallization solvent have a fairly low boiling point?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?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 difficult
- What are emulsions? Why do they form during extractions? How is the formation of an emulsion minimized?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?Acetone and isopropyl alcohol are generally not suitable for use in extraction, but are frequently used as recrystallization solvents. Explain
- Briefly discuss how to identify the unknown compound by using mixed melting point method.What is the main drawback of using steam distillation in the isolation of volatile oils from its matrix?If fine sand were an impurity in a sample, how would it effect the melting point? What would make you suspicious that something inert like sand was contaminating your sample?