Lab 14: Ester Synthesis
In the Ester Synthesis Lab, my partner and I synthesized chemical compounds that produced different smells. We mixed ten drops of three different alcohols with glacial acetic and concentrated sulfuric acid in three test tubes. Then we submerged the test tubes in 70 °C water (H2O) for ten minutes. After ten minutes, we smelt the three solutions.
Analysis Questions
1. Compare odors of the three mixtures after heating compared to the odors of the starting materials. How are the different?
Before heating, all the mixtures smelled close to cleaning supplies. After heating, the mixtures smell sweet.
2. Based on the smell of the mixture after heating, what functional group must be present in the final molecules that were produced? Draw it.
Ester is present in the final molecule that was produced.
3. Were the new compounds easily identified as a specific fragrance like apple or banana? In the case where a specific fragrance was detected, how does the odor compare to the natural fragrance?
Some compounds were easier to identify than others. All the fragrances were created artificially compared to the natural fragrances.
Challenge Questions
1. In this lab, hydroxl, -OH group, breaks off from the acid molecule. In addition, the H-O bond in the alcohol molecule must also break. A new bond forms as the larger molecular pieces come together to form an ester. Finally, you can see that the H- and -OH pieces that are left over combine to form H2O, water. The reaction between acetic acid and isopentanol in a test tube produced a sweet smell. Draw the structural formulas of the products, water and isopentyl acetate.
1. Compare odors of the three mixtures after heating compared to the odors of the starting materials. How are the different?
Before heating, all the mixtures smelled close to cleaning supplies. After heating, the mixtures smell sweet.
2. Based on the smell of the mixture after heating, what functional group must be present in the final molecules that were produced? Draw it.
3. Were the new compounds easily identified as a specific fragrance like apple or banana? In the case where a specific fragrance was detected, how does the odor compare to the natural fragrance?
Some compounds were easier to identify than others. All the fragrances were created artificially compared to the natural fragrances.
Challenge Questions
1. In this lab, hydroxl, -OH group, breaks off from the acid molecule. In addition, the H-O bond in the alcohol molecule must also break. A new bond forms as the larger molecular pieces come together to form an ester. Finally, you can see that the H- and -OH pieces that are left over combine to form H2O, water. The reaction between acetic acid and isopentanol in a test tube produced a sweet smell. Draw the structural formulas of the products, water and isopentyl acetate.
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