Systhesis of Dulcin

deduction of Dulcin Objective The main objective of this research laboratory is to gain experience at a typical synthesis and semi-microscale recrystallization. Discussion Questions 1) How immobile should the temperature be asc windupingd when determining a melt down decimal consign? When can the temperature be raised much quickly? 2) If thither is an Impurity present in a sample, what is the load on the dissolve present? 3) Explain why a) salt, spread on roadstead in the winter, helps prevent frosting in, for instance, southern Ontario, and b) salt is uneffective on the much colder roads of Manitoba. ) You would pitch to slowly raise the temperature up when determining the run point due to the sensitivity of the dulcin beingness satisfactory to tack from solid to liquid state at any point. If the temperature is piece to gritty to fast it is possible to miss the change of state and not be able to record the time which is why it should in briefer be set pretty s low. If set in high spirits too fast it volition melt faster causing the melting point to be inaccurate. As soon as you lease the general melodic theme of when change in state forget occur, that is when you can probably raise the temperature more quickly. ) If there are impurities present in the sample it can cause many a(prenominal) problems, it can lour or raise the boiling point due to it having an effect on the dulcin itself. Basically it leave profit the range of the boiling and melting points, which will give an inaccurate reading. If the dulcin were to be full virtuous the range would have a difference of maybe 1 to 2, having an scoria would make a huge difference. 3) common salt is sprinkled on the streets so that when it mixes with the moisture and the pissing it creates a saline solution mixture.This mixture has a lower freezing point thusly normal water does so that elbow room it would only freeze at lower temperatures. This fundamentally prolongs the icing process and basically can fully prevent grump from put to working on the roads. On older colder roads of Manitoba it reaches the colder temperatures necessary to freeze over the saline mixture which ends up making it useless to do. Conclusion Yield To calculate you mustiness take the amount of rough-cut dulcin you started with and have it divided by the pure dulcin then(prenominal) multiply it by 100 to get a %. Pure Dulcin 0. 6168g Crude Dulcin 1. 2356g resolve point of crude 167-171Melting point of pure 174-176 The recrystallization process is one that has been tested quaternary times and been proven effective in many experiments. In our experiment I would have to say that it was a rattling effective process due to the melting points that we were able to get with our products. The melting point for the crude substance was between 167 and 171 . This shows that the crude definitely had rough impurities in it keeping it a bit away form the theoretical melting point. The me lting point of our pure substance was between 174and 176 which is real extremely close to the theoretical melting point.This shows us that the recrystallization process does an extremely well-grounded job, even though it takes a stria of time and effort to do it. thither way be some flaws with it and some error that can come some with how the apparatus is set up or how the students take care of the products. In the end it is a great process and if the technique is done properly and precisely the effectuality off this process is very high and produces great results. Reference University of Winnipeg CHEM-2202/3 original Chemistry I Lab manual(a) Fall 2012