Which of the following methods is not an appropriate method for purifying a solid under normal laboratory conditions? sublimation chromatography distillation recrystallization
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- There are two forms of HPLC – normal phase HPLC and reversed phase HPLC. In normal phase HPLC, the stationary phase is silica and the mobile phase is a non-polar solvent like hexane. What are the stationary and mobile phases in reversed phase HPLC?What is the function of a desiccant in a set-up of volatilization gravimetry? To remove nitrogen from the sample To remove sulfuric acid from the sample To remove water vapor from the sample To remove carbon dioxide from the sample1. What is the limitation of the sublimation laboratory technique? 2. When can sublination be applied as a process of separation?
- For each of the following statements, answer TRUE or FALSE and explain your answer briefly. It is preferred to apply potassium dichromate solution over neutral density filter to check the photometric accuracy of UV-visible spectrophotometer.Relative amounts of fluid given off and reabsorbed by a model capillary, and what compensates for the difference between filtration and reabsorptionWhich technique is based on the stronger attractionsome components have for the stationary phasecompared to the mobile phase? A. filtration D. chromatographyB. distillation E. sublimationC. crystallization
- What is the instrumentation of Conductometry ?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 difficultWhat are other experimental methods other than the cryoscopic method by which the molecular weight of a non-volatile solid substance may be determined. Explain the process.