Obtain sample of two compounds with the same mp\'s. Mix approximately equal port
ID: 484008 • Letter: O
Question
Obtain sample of two compounds with the same mp's. Mix approximately equal portions of each compound, and grind them together. Determine the mixture melting point of this sample. Note any differences between this determination and the previous ones. Record the values you observed in this experiment on the proper form, and turn it in to your instructor. There are two types of impurities that can contaminate a sample. What are they? How do they affect the observed melting points? You have synthesized a new compound; one which has never been prepared. How would you determine its mp? What precautions could you take to ensure that it is as accurate as possible? Based on the effect of impurities, how would you explain the results you got from the mixture melting point experiment? You have a sample of an unknown substance, although you think you know its identity. How could you establish whether or not the material is what you suspect? If you heat your sample too rapidly, the mp you record will be incorrect. Would you expect the value to be too high or too low? Why shouldn't you use a sample that has been melted and solidified to confirm a melting point? A sample of an unknown compound has a mp of 145-154^degreec. What conclusions would you draw? What action would you take? How can you determine if a compound is decomposing rather than malting? Under what circumstances could a mixture of two compounds give a sharp melting point?Explanation / Answer
Answer for 3rd question:
If a sample is impure, the melting point of it is usually lower than that of pure sample. Very often we end up getting the melting point as a range of temperature, not a fixed temperature. Melting point of a sample with a range of more than 5 degree centigrade is an indication of impure sample. If the range is too large, it is so impure and if the range is too less, it is pure.It is called as melting point deppression.
Answer for 5th question:
Always slow heating of the sample is rewuired to get a correct melting point. Heating the sample too rapidly causes the thermometer reading vary from the actual temperature of heating machine therefore we may endup getting an higher temperature value in the thermometer than the actual melting point. So the obtained values can be to higher than the original values.
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