An ester is an organic compound that is formed when a carboxylic acid reacts with an alcohol. Moons, J. 2013). A carboxylic acid is an organic acid that contains one or more carbonyl groups. Justification typically requires a catalyst to speed the reaction. A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. Google, (2013). When carboxylic acids are satisfied, some of the resulting esters are liquids with a fruity scent or flavor.
This lab demonstrate how an ester can be made by the interaction of a carboxylic acid and an alcohol and I will be able to verify that the justification reaction has taken place by the formation of a precipitate or distinctive change in dour. Materials: -Test tubes -Test tube rack -glass stirring rod -mall beaker-test tube tongs -ethnic acid -Salicylic acid -botanic acid – I-butane – I-pentagon – Sisyphean-l-OLL -n-propane – n-octagon -Methanol -Ethanol -concentrated sulfuric acid (used as a catalyst) Procedure: 1. Safety glasses were put on. 2.
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The hot water bath was prepared by filling a mall beaker with mall of water. It was then brought to Just below a gentle boil. 3. Nine test tubes were placed on a test tube rack 4. 7 of the test tubes were labeled with the seven different alcohols used (I-butane, I-pentagon, Sisyphean-l-OLL, n-propane, n-octagon, methanol and ethanol. ) 5. Odors of each alcohol were cautiously wafted, and recorded in the observation table. 7. 2 test tubes were labeled as ethnic acid and botanic acid, salicylic acid was written on a small sheet of paper that was used for weighing the salicylic acid. Approximately 2. Ml of ethnic acid was placed in a test tube and 0. Ml of botanic acid was place in another. 0. Egg salicylic acid was weighed. 9. The odors of the carboxylic acids were smelt by wafting and results were recorded. 10. 0. Ml or 0. Egg (depending of if it is a solid or liquid) of the appropriate carboxylic acid was mixed with the appropriate alcohol. The components were mixed by gently and carefully swirling the test tube. 11. 3 drops of concentrated sulfuric acid was added drop-by-drop to the mixtures. 12.
All 7 test tubes were placed in the water bath and feet there for 10 minutes. 13. Test tube tongs were used to pick up each test tube and the scents from the test tubes were wafted and recorded. Observation Table Alcohol Alcohol odor Carboxylic acid Carboxylic Acid Odor Odor of Ester I-butane Light vinegar Ethanol Acid Vinegar Bubble gum I-pentagon Permanent marker Apple Sisyphean-l -01 Pool Chlorine Banana n-propane No smell n-octagon Cleaner Rotten orange Salicylic Acid Bleach Mint Ethanol Sour milk Botanic Acid Stinky feet Pineapple References Johns,J. (2013). Making sense of scents lab intro