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What are the different phase changes involved in the purification using sublimation experiment?
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- What is the relationship between vapor pressure at a temperature and its melting point so that sublimation can occur? What are the different phase changes involved in the purification using sublimation experiment?Heating of the oil bath must done slowly to get a more accurate reading of the melting point of a sample. Why must this be done slowly?What effect does the presence of impurity have on the melting point?
- 4. When performing a melting point on a solid compound using a melting point apparatus, two melting point determinations were made. One sample, which was 1 mm in height in the capillary, possessed a melting point of 200.0-200.5°C. The other sample was 25 mm in height. What would you expect the approximate melting point to be for this sample, assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of the sample) (Give an actual numerical approximation!) 5. For the same solid compound as the question above, if the 1 mm sample was heated at 60° per minute on a melting point apparatus, what would you expect for an approximate melting point? (note that at this heating rate, the sample will melt rather quickly, but again give an actual numerical approximation)3. A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 172°C and finished melting at 177°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. 4. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If the literature value for the melting point of acetaminophen = 169-170.5°C, would the young chemist be wise to consume this product for headache relief? Why or why not?How would the observed boiling point of ethanol and water be affected if distillation was performed on top of a mountain? Explain
- Chemistry 5. You melt the substance and de-coloration occurs. Unfortunately, you weren’t paying attention and miss the melting point. Should you start over or re-melt it? Or both are options ‘okay’? 6. When measuring the melting point of a substance, it suddenly disappears. What has happened? Can you still measure the melting point? If so, how? 7. We should not re-use a sample in a capillary tube for melting point measurement. Why not? 8. It takes significant amount of time for the melting point apparatus to cool down before next measurement if your new sample has a lower melting point than your previous one. What can you do to reduce this time in between measurements when many samples of different melting points are used?Due to the fact that the liquid you used was a volatile one, it will not completely recondense. Some of the liquid remains in the vapor phase, even at room temperature. If you were able to correct for this by making the vapors recondense completely, would your final molar mass value be greater than, less than or the same as the value you determined? Explain your reasoning.BRIEFLY explain why steam distillation can be used to purify or isolate temperature-sensitive materials.
- Explain how the melting point of a compound that sublimates gets obtainedis a melting point alone sufficient to idenitfy a compound? why or why not?Why is it best to cool a solution slowly as a solid crystallizes? impurities are more likely to crystallize as well when done quickly the solid obtained will have a higher purity when done quickly no solid will form when done quickly the solvent could start to boil again when done quickly