Ester homologous seris
What is the Ester functional group
...O
...||
–C–O–
-COO-
What is the displayed formula for an Ester
...O
...||
–C–O–
How are Esters made
Alcohol + carboxylic acid —> ester + water
Are catalyst required for this reaction?
Yes-Concertrated sulfuric acid
How would you draw a displayed formula for an Ester
1. Draw the alcohol displayed formula and carboxylic acid formula
2. Make sure that the functional groups of facing in the middle towards each other
3. Take off 2 hydrogens
4. Join them together
What is the process called when you add an alcohol and a carboxylic acid together
Esterification or condensation reaction as water is being produ ed
What type of reaction is making an Ester
Reversible
Do Esters have a smell?
Yes-Sweet and fruity- Can be used in perfumes, food flavouring, cleaning products and in solvents(less common)
Why are Esters used in food flavourings for example?
They are volatile meaning they evaporate easily so receptors in your nose can detect them
How do you make an Ester in a laboratory?
1. Add a few drops of concentrated sulphuric acid to a boiling tube using a pipette
2. At 1cm³ of ethanoic acid ans 1cm³ of ethanol
3. Place the boiling tube in a beaker of hot water heated by Bunsen Burner to approximately 80°c
4. Leave on the heat for 5 minutes and then let cool
5. Pour into a beaka half filled with 0.5 mol/dm³ sodium carbonate solution
6.A layer of Ester should form on the surface of the cold sodium carbonate solution
7. Smell by wafting across the top of the boiling tube