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How does the rate of temperature elevation influence the results of the melting point determination?
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- 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 difficult1. What is the limitation of the sublimation laboratory technique? 2. When can sublination be applied as a process of separation?Briefly describe the technique for packing a capillary melting point-tube
- BRIEFLY explain why steam distillation can be used to purify or isolate temperature-sensitive materials.In order to obtain accurate data it is important to add hear slowly and steadily when the temperature gets close to the melting point of a sample. Why is necessary?If we give same sample to three different students in the same lab, why the result of melting point slightly differ from each other?
- 1. Why does the solid need to be finely ground and then tightly packed in a melting point capillary tube?2) Explain why it is common practice to determine a melting point on an unknown compound rapidly first, and then to rerun the melting point slowly.What is the advantage of using Buchner filtration in filtering crystals? Q4. Briefly explain how scratching the wall of the glass flask can help formation of crystals.
- Is a mobile phase composition 40:60 of acetone:hexane more polar than a mobile phase composition of 25:75 acetone:hexane?What effect does the presence of impurity have on the melting point? Can the amount of impurity be quantified by melting point determination?explain how mixed melting point determination can be used to identify a solid compound.