3. Reactions and uses of esters

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6 Terms

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Useful properties of esters

  • Fragrances

  • Polar liquid therefore a good solvent

  • Plasticisers

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acid hydrolysis

Draw the general reaction for this:

Use methyl ethanoate as an example: - page 428

when a molecule is split up by water with a strong acid catalyst and in reflux. you get a carboxylic acid and an alcohol.

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base hydrolysis

Draw the general reaction for this:

Use methyl ethanoate as an example: - page 428

  • Reflux the ester with a dilute alkaki such as sodium hydroxide in reflux. You get a carboxylate ion and an alcohol.

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Draw glycerol

Draw triglyceride

page 430

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What do we use to hydrolyse fats and oils

Draw the equation - page 430

sodium hydroxide (base hydrolysis)

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How to make biodiesel

Draw this using methanol - page 430

what does this make?

Add an alcohol to a fat - 3 lots of methanol

KOH catalyst

glycerol + 3 lots of alcohol ester