Why Are Fatty Acids Classified as Acids Despite Producing OH- Ions?

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Fatty acids are classified as acids due to their carboxylic group (-COOH), which dissociates in water to release hydrogen ions (H+), confirming their acidic nature. Despite producing hydroxide ions (OH-) during the condensation with glycerol, the presence of H+ ions in solution is what defines them as acids. This classification aligns with traditional definitions of acids as covalent molecular compounds that yield H+ ions when dissolved in water. The process of fat synthesis involves the donation of OH- ions from fatty acids and H+ ions from glycerol to form triglycerides.

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donaldcat
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Three fatty acid, when condense with glycerol, they donate or give out their OH- ions and combine with the H+ ions to form water and fat molecule. According to my chemistry teacher, an acid is a covalent molecular compound, which when dissolved in water, forms hydrogen ions H+ (aq). As fatty acid forms OH- when dissolved in water, why it is called as an acid but not an alkaline?
 
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donaldcat said:
Three fatty acid, when condense with glycerol, they donate or give out their OH- ions and combine with the H+ ions to form water and fat molecule.

Actually, it is the carboxylic group -COOH that gives the acidity to http://www.biology.lsu.edu/introbio/Link2/fatty%20acids.gif on a fatty acid, with dissociate into H+ and COO- making the solution acidic. This conforms to your teacher's definition of an acid.

When fat synthesis occurs, the fatty acids each do contribuite an OH- and the glycerol 3 H+ to form a fat molecule.
 
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