What are the functional groups of a molecule of soap?
The hydrophobic tail is a functional group is simply a string long hydrocarbon. The only functional group of a fatty acid (which makes soap) is the carboxylic acid (COOH) group, but when subjected to a saponification which became the carboxylic acid salt (which is hydrophilic). So the only real functional group of a molecule of soap is a salt of “acid carboxylic acid (usually COO-Na +) Hope this helps!
