Potassium stearate is obtained by the saponification of an oil or fat. It has formula CH\(_3\)–(CH\(_2\))\(_{16}\)–COOK. The molecule has a lyophobic terminal CH\(_3\) and a lyophilic terminal –COOK. Potassium stearate is an example of
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Soap + water → micelle formation (cleansing action).