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Why should a piece of filter paper inside the developing chamber be moistened with the developing solvent before the plate is developed
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- what would be the implications if the volume reduction is skipped in the recrystallization?Why should the recrystallization solvent have a fairly low boiling point?Based on the readings and lecture on emulsions, and the procedures for this lab answer the following question. What is the dispersed phase in the simple vinaigrette? Air Oil Water Egg
- When is a PTFE buret used? _________________________________________________________ _ _________________________________________________________________________________ Describe the recommended method for the manipulation of a buret stopcock during titration. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Why is it necessary to completely fill the rubber tubing of the stopcock with the solution before titration? ________________________________________________ ____________________________________________________________________________________________________________________________________________________Briefly explain the reasons for the use of the following techniques in this experiment. a. The hydrate salt is heated with the crucible cover in an ajar position rather than in a fully seated position or having the crucible completely uncovered. b. The crucible cover is fully seated during cooling and weighing of the residue.Why must the spots be above the level of the development solvent in the developing chamber?
- Briefly discuss how to identify the unknown compound by using mixed melting point method.Purification of benzoic acid 1. What is the purpose of washing the crystal in the filter paper with water? 2. How recrystallization affects the theoretical yield of sample? Explain.If insoluble impurities, e.g., dust, tissue, filter paper, etc., were mixed with the sample, how would these affect the measured melting point?