Tell whether each of the experimental errors in Exercise 3 will affect the melting point, and explain why.
It was hard to tell when all of the unknown had dissolved because white flakes remained even as I kept adding hot water. When I was making the mixtures to put in the capillary tubes, another clue was given that the unknown was in fact phenacetin. However, there is a suspicion that this bottle may be counterfeit, not containing the chemicals that it should.
Extra care should be taken when lowering the temperature of a beaker to avoid this issue. It is also important to make sure that the resulting melting points are close to what the proven melting points of the substances are.
We suspect that this unknown compound is either acetanilide or phenacetin, both of which can be toxic to humans. When mixed with m-aminophenol, the melting point dropped by 20 degrees. When boiling the water before placing it in the unknown, my water never actually came to a boil.
Also, the lab manual says to take two samples of each mixture unknown;? Panacetin is an analgesic pain reducing and antipyretic fever reducing drug that is sold in drug stores. Also, at any time during this experiment, chemicals from other equipment such as stirring rods, beakers, spatula, etc.
The small range and extremely close melting points give further evidence that the unknown is phenacetin. It is possible that some of the impurities in the unknown dissolved into the hot water, along with the unknown.
Pure acetanilide was a brownish color, as compared to both pure phenacetin and the unknown, which were both white. In order to conduct this experiment, the instructions on page 59 were followed, with only a few exceptions. Therefore, when we mix our unknown with samples of phenacetin and acetanilide, whichever mixture has a more accurate melting point will tell us what our unknown is.
Either way, the fact that it took 51mL was a good indicator that my unknown was phenacetin, due to phenacetin having a much lower solubility than acetanilide. None Chemistry TA: This may have affected the amount of material that I got to dissolve. Alma Wellensiek Lab 3: This is in opposition to a mixed, or contaminated substance, which will have a broad melting range.
The structures of phenacetin and acetanilide are shown respectively. There were a few safety concerns in this lab.
Since any added chemicals will lower the melting point and expand the range, these potential and pretty likely experimental errors could have changed the melting point. Both phenacetin and acetanilide are known to be mild irritants, thus contact with skin and eyes should be avoided or minimized around the unknown.
In addition to our unknown, we used phenacetin, acetanilide and water. Panacetin should be made up of about 50 percent of the unknown component that we previously separated out of Panacetin for testing.
As the experiment progressed, it became more and more clear that the unknown was phenacetin, starting with the fact that their solubilities were much closer.
I also noticed that even though I had put in more hot water than phenacetin should have needed to dissolve Another issue to keep in mind is that we will be moving glass from hot to cold surfaces, which can cause the glass to crack or break. The purpose of this experiment is to determine the unknown component of Panacetin.
I assumed these to be impurities. This whole experiment is based on purifying and then finding the melting point of the unknown compound. It was steaming very heavily and I was losing a considerable amount of water, especially from my smaller beaker, so I had to just assume that it was hot enough.
The theory is that if a substance is pure, it will have a very specific melting point, within one or two degrees Celsius. Both of these are major drops, indicating that it is neither of these substances.
The unknown began to melt at C and was finished by C and the phenacetin and unknown mixture began melting at C and was totally melted by C.Identifying a Constituent of “Panacetin” Essay The purpose of this experiment was to determine the unknown component of panacetin.
Panacetin contains aspirin, sucrose, and an unknown component. Panacetin should be made up of about 50 percent of the unknown component that we previously separated out of Panacetin for testing.
We suspect that this unknown compound is either acetanilide or phenacetin, both of which can be toxic to humans.
Emily Davis Partner: None Chemistry TA: Alma Wellensiek Lab 3: Identifying a Constituent of “Panacetin” 9/15/ Purpose: The purpose of this experiment is to determine the unknown component of Panacetin. Theory: Panacetin is an analgesic (pain reducing) and antipyretic (fever reducing) drug that is sold in drug stores.
However. View Lab Report - Lab 02 03 - Separation and Identifying a Constituent of Panacetin - Co from CHM C at Florida State College at Jacksonville. LABORATORY REPORT Lab #2 & 3 Separating and%(8). Answer to it's about an organic lab " Identifying a constituent of Panacetin".
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Identifying a Constituent of Panacetin. FOR ONLY $/PAGE. Order Now. This experiment was a continuation of Experiment two, with a slightly different question to be answered. In this experiment, we are trying to find the identitiy of the unknown component of Panacetin.
This is answering question 2 of the two questions that were to be.Download