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Introductory Experiment: Acetamide Lab Purpose:
To observe the cooling curve of:
Pure acetamide (ehtanamide)
Impure acetamide (Nal added ad an impurity) Procedure: Please refer to next page.
Data: Record both qualitative and quantitative observations.
Time(Sec.) Pure:Tempt.(*C) Impure:Tempt.(*C)
0 82 72 30 79 71.5 60 77.8 68 90 76.9 65 120 76.2 63 150 76 61 180 76 58.5 210 76 56.5 240 75.9 55.5 270 75.5 55.5 300 75.1 55.5 330 74.9 55.5 360 74.5 53.5 390 74 53.5 420 73.8 51.5 450 73.5 51 480 73.3 50 510 73.1 50 540 72.9 49.5 570 72.1 49.5 600 72 49 630 71.4 48.5 660 70.9 48 690 70.5 47.5 720 70.2 47 750 70 46.5 Graphing:
Questions:
1．The temperature of the freezing point of the pure acetamide is 77.
2．The temperature of the freezing point of the impure acetamide is 55.
3．The similarities of the graph are the first temperature of them is both high, and the temperature is staying in the same at 3 different times. The difference of the graph is the temperature of the pure acetamide is higher than the impure. Also the impure is cooling faster than the pure acetamide.
4．The elements all pure are all the same, but impure’s are different. So in this graph, two lines have the space between.
5. Cools below freezing point but it still liquid. When you shake it, it will crystalize.
6. A) Adding salt to water to raise the boiling point of water, enabling it to have a higher heating capacity.
B) Put nickel into iron that can make alloy becomes rustless.
Error Analysis During this lab, the first error I made was I use too much time to heat up the pure acetamide, so I couldn’t finish lab in the class time. Therefor I only can record the data for 12.5mins. The second error I made was when I took the test tube out of the hot water, the hot-air of the hot water was still heat the test tube that my temperature of the test tube was very high. The last error that I made was when I record the temperature, sometimes I use more than 30 second, so
To observe the cooling curve of:
Pure acetamide (ehtanamide)
Impure acetamide (Nal added ad an impurity) Procedure: Please refer to next page.
Data: Record both qualitative and quantitative observations.
Time(Sec.) Pure:Tempt.(*C) Impure:Tempt.(*C)
0 82 72 30 79 71.5 60 77.8 68 90 76.9 65 120 76.2 63 150 76 61 180 76 58.5 210 76 56.5 240 75.9 55.5 270 75.5 55.5 300 75.1 55.5 330 74.9 55.5 360 74.5 53.5 390 74 53.5 420 73.8 51.5 450 73.5 51 480 73.3 50 510 73.1 50 540 72.9 49.5 570 72.1 49.5 600 72 49 630 71.4 48.5 660 70.9 48 690 70.5 47.5 720 70.2 47 750 70 46.5 Graphing:
Questions:
1．The temperature of the freezing point of the pure acetamide is 77.
2．The temperature of the freezing point of the impure acetamide is 55.
3．The similarities of the graph are the first temperature of them is both high, and the temperature is staying in the same at 3 different times. The difference of the graph is the temperature of the pure acetamide is higher than the impure. Also the impure is cooling faster than the pure acetamide.
4．The elements all pure are all the same, but impure’s are different. So in this graph, two lines have the space between.
5. Cools below freezing point but it still liquid. When you shake it, it will crystalize.
6. A) Adding salt to water to raise the boiling point of water, enabling it to have a higher heating capacity.
B) Put nickel into iron that can make alloy becomes rustless.
Error Analysis During this lab, the first error I made was I use too much time to heat up the pure acetamide, so I couldn’t finish lab in the class time. Therefor I only can record the data for 12.5mins. The second error I made was when I took the test tube out of the hot water, the hot-air of the hot water was still heat the test tube that my temperature of the test tube was very high. The last error that I made was when I record the temperature, sometimes I use more than 30 second, so