Exp 10 Prelab
Khoa Kirk Hoang
OCHEM 262
Lab: Exp 35- Oxidation + Reduction
Tablular Data Pre-Weighted Flask | Product + Flask | Product | % Yield | 5.36g | 5.401g | 0.041g | 41% |
(60-70% = Acceptable) Actual Melting Point | Experimental Melting Point | 212C | 199.8 |
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(10C-15C variations acceptable)
Reasons %yield: A reason that our percent yield is lower then what is acceptable can be due to various reasons. First, the amount of product we are working with is only .1g which is a very small amount. Little by little could be loss through transfers, scrapings, Hirsch funnel suction, and dried-product left on the glass in the test tubes. If, .01g is lost through these processes, this equates to essentially 10% yield reduction each time. For example, during transfers from weighing paper to beakers, some product could be left over in the paper. Also, another factor could be due to heating. If we accidently boiled are contents to high, we could have melted the product and lost it permanently.
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Reasons Melting Point: Professor has told us that our melting point is acceptable. The main reason is because during the Evap, the reaction occurred so fast that much of the solvent is contained in the crystals. So the actual melting point is nearly impossible to reach, and 10C-15C variation is acceptable.
Questions
1). The infrared reading comparison between camphor and borneol+isoborenol is that camphor does not have a OH-stretch at 3400, but it does have a C=O stretch around 1700-1750 that borenol and isoborneol doesn’t have. The IR readings of isoborneol and borneol look very similar the major difference is that isoborneol has a higher intensity reading from the 1500-1000 wavenumbers.
2). The peaks are different due to the position of the OH. In borenol, the OH is in the endo position, making it further away from both of the methyl groups, this is why they have
OCHEM 262
Lab: Exp 35- Oxidation + Reduction
Tablular Data Pre-Weighted Flask | Product + Flask | Product | % Yield | 5.36g | 5.401g | 0.041g | 41% |
(60-70% = Acceptable) Actual Melting Point | Experimental Melting Point | 212C | 199.8 |
-------------------------------------------------
(10C-15C variations acceptable)
Reasons %yield: A reason that our percent yield is lower then what is acceptable can be due to various reasons. First, the amount of product we are working with is only .1g which is a very small amount. Little by little could be loss through transfers, scrapings, Hirsch funnel suction, and dried-product left on the glass in the test tubes. If, .01g is lost through these processes, this equates to essentially 10% yield reduction each time. For example, during transfers from weighing paper to beakers, some product could be left over in the paper. Also, another factor could be due to heating. If we accidently boiled are contents to high, we could have melted the product and lost it permanently.
-------------------------------------------------
Reasons Melting Point: Professor has told us that our melting point is acceptable. The main reason is because during the Evap, the reaction occurred so fast that much of the solvent is contained in the crystals. So the actual melting point is nearly impossible to reach, and 10C-15C variation is acceptable.
Questions
1). The infrared reading comparison between camphor and borneol+isoborenol is that camphor does not have a OH-stretch at 3400, but it does have a C=O stretch around 1700-1750 that borenol and isoborneol doesn’t have. The IR readings of isoborneol and borneol look very similar the major difference is that isoborneol has a higher intensity reading from the 1500-1000 wavenumbers.
2). The peaks are different due to the position of the OH. In borenol, the OH is in the endo position, making it further away from both of the methyl groups, this is why they have