Carboxylic acids. Starter Which of the following formulae represent carboxylic acids? 1.CH 3 CH 2 CH(CH 3 )COOH 2.(CH 3 ) 2 CHCHO 3.CH 3 CH 2 OH 4.C 6.

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Presentation transcript:

Carboxylic acids

Starter Which of the following formulae represent carboxylic acids? 1.CH 3 CH 2 CH(CH 3 )COOH 2.(CH 3 ) 2 CHCHO 3.CH 3 CH 2 OH 4.C 6 H 5 CH 2 COOH

Learning outcomes Recall the functional group of a carboxylic acid and an ester Describe the solubility of carboxylic acids Explain why they react like acids Apply the rules of naming an ester to naming esters

Carboxylic acids A large number are found in nature, where they are often the cause of a sharp or sour taste

Ethanoic acid 2-Hydroxypropane-1,2,3- tricarboxylic acid Butonic acid 2-hydroxybutanedioic acid Methanoic acid 2-hydroxypropanoic cid

Bonding and acid reactions carboxylic bonding challenge.doc Carboxylic acids challenge2.doc

Esterification Reactants Carboxylic acid and alcohol Conditions Heat and concentrated H 2 SO 4

Naming esters Propanoic acid + ethanol  ethyl propanoate __________ + methanol  methyl pentanoate Butanoic acid + butanol  __________ + _______  propyl methanoate

Naming esters Make three rules for naming esters The alcohol stem comes at the start of the ester name; The acid stem provides the second part of the name The name of the ester usually ends with -anoate

Plenary Write three facts about carboxylic acids Name the ester made from these reactants methanoic acid + ethanol ethanoic acid + butanol propanoic acid + methanol