The purpose this experiment was to identify our unknown compound, either and aldehyde or ketone, based on a series of tests. This experiment was completed over two weeks in order to dry the crystals and determine the melting point. The unknown that we were assigned was 501 G. A series of tests were performed on this unknown compound in order to figure out the identity. A summary of the results of the tests is shown below.
Distillation:
Boiling Point: 179.0°C-194.0°C
Qualitative Tests:
1. 2,4-DNP Test
• Melting point: 240.0°C-245.0°C
2. The Tollen’s Test
• Unknown: Negative, compound remained clear and did not form silver mirror
• Standard (isobutyl r-aldehyde): Positive, silver mirror formed
3. The Schiff’s Test
• Unknown: Negative, no …show more content…
This would have conflicted with our identification of the unknown because all the other tests were a negative, which meant it was not an aldehyde but a negative Iodoform test meant that is was not a ketone, which obviously makes no sense since it has to be either an aldehyde or ketone. The Idoform solution was placed aside and we continued with the remaining tests. After a few minutes, there was a precipitate formed in the test tube, which meant that our Iodoform test had given us a positive. Because of this we were able to conclude that our unknown was a ketone. Our standard for the Iodoform test gave a precipitate almost immediately, and we expected for our unknown to do the same, which is why we concluded that it had been a negative at first.
Our unknown was identified to be Acetophenone, a ketone. Based on the all the data gathered, it is the most reasonable compound. The unknown had the closest boiling point to Acetophenone, all the qualitative tests determined it to be a ketone, and the IR spectrums of both are extremely similar, especially towards the fingerprint region. The structure of Acetophenone is shown
Distillation:
Boiling Point: 179.0°C-194.0°C
Qualitative Tests:
1. 2,4-DNP Test
• Melting point: 240.0°C-245.0°C
2. The Tollen’s Test
• Unknown: Negative, compound remained clear and did not form silver mirror
• Standard (isobutyl r-aldehyde): Positive, silver mirror formed
3. The Schiff’s Test
• Unknown: Negative, no …show more content…
This would have conflicted with our identification of the unknown because all the other tests were a negative, which meant it was not an aldehyde but a negative Iodoform test meant that is was not a ketone, which obviously makes no sense since it has to be either an aldehyde or ketone. The Idoform solution was placed aside and we continued with the remaining tests. After a few minutes, there was a precipitate formed in the test tube, which meant that our Iodoform test had given us a positive. Because of this we were able to conclude that our unknown was a ketone. Our standard for the Iodoform test gave a precipitate almost immediately, and we expected for our unknown to do the same, which is why we concluded that it had been a negative at first.
Our unknown was identified to be Acetophenone, a ketone. Based on the all the data gathered, it is the most reasonable compound. The unknown had the closest boiling point to Acetophenone, all the qualitative tests determined it to be a ketone, and the IR spectrums of both are extremely similar, especially towards the fingerprint region. The structure of Acetophenone is shown