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# Carboxylic acid definition

Carboxylic acids are organic molecules containing the acidic functional group $\ce{-COOH}$. They have the general formula $\text{C}_\text{n}\text{H}_{2\text{n}+1}\text{COOH}.$

The functional group of carboxylic acids, ($\ce{-COOH})$, is called the carboxyl group.

Carboxylic acids are colourless liquids at room temperature and pressure.

The table shows the first four acids in the homologous series.

Name Diagram Formula
Methanoic acid
$\ce{HCOOH}$
Ethanoic acid
$\ce{CH3COOH}$
Propanoic acid
$\ce{C2H5COOH}$
Butanoic acid
$\ce{C3H7COOH}$