carboxylic acids. starter which of the following formulae represent carboxylic acids? 1.ch 3 ch 2...
TRANSCRIPT
Carboxylic acids
Starter
Which of the following formulae represent carboxylic acids?
1. CH3CH2CH(CH3)COOH
2. (CH3)2CHCHO
3. CH3CH2OH
4. C6H5CH2COOH
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 H2SO4
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