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Carboxylic acids Methanoic acid Muurahaishappo also called formic acid HCOOH Ethanoic acid Etikkahappo vinegar E260 CH3COOH Ethanol is oxidised to become ethanoic acid Propanoic acid Propionihappo Many uses – eg preserving food, curing fungal infections on feet C2H5COOH Butanoic acid Voihappo It is found in rancid butter, parmesan cheese, vomit, and body odor and has an unpleasant smell C3H7COOH Pentanoic acid Valeriaanahappo Found in the plant valerian which has been used as a herbal sedative C4H9COOH Other carboxylic acids - foods Citric acid E330 Sitruunahappo– lemons, oranges, limes Ascorbic acid E300 – vitamin C Lactic acid, E270 Maitohappo Malic acid Omenahappo Oxalic acid Oksaalihappo Other carboxylic acids Amino acids – in DNA Salicylic acid – willow bark -> aspirin pain relief Ulcer Carboxylic acids are used to make esters, a group of smelly (often nice smelling) chemicals Alcohol + carboxylic acid -> ester + water
