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Posted by MissChemTeacher_Bitesize (U15172316) on Friday, 4th January 2013
Here are some questions on Esters to get you thinking before your prelims.
1) Name the ester formed with butanoic acid and propanol react together.
2) Draw the structure of the ester formed.
3) Why is an esterification reaction also known as a condensation reaction?
4) Name the catalyst used in the preparation of an ester.
5) Why is a wet paper towel wrapped around the mouth of the test tube when preparing an ester?
6) What signs are there that an ester has been formed in the reaction?
Post a message if you need help answering any of these questions. I'll put some solutions up in a few days.
Posted by MissChemTeacher_Bitesize (U15172316) on Thursday, 10th January 2013
Solutions to the Questions:
1) butyl propanoate
3) When the acid and the alcohol react together to form an ester a molecule of water is released in the process. That is why it's known as a condensation reaction.
4) Concentrated sulphuric acid.
5) It acts as a condenser so even if the reactants or ester start to evaporate the condenser turns it back into a liquid in the test tube.
6) Esters have a very characteristic smell and you can see the ester layer floating on top of the sodium hydrogen carbonate solution.
If you have any questions about esters get in touch.
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