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Soap scum or lime soap is the white solid composed of calcium stearate, magnesium stearate, and similar alkaline earth metal derivatives of fatty acids. These materials result from the addition of soap and other anionic surfactants to hard water .
Calcium stearate is produced by heating stearic acid and calcium oxide: . 2 C 17 H 35 COOH + CaO → (C 17 H 35 COO) 2 Ca + H 2 O. It is also the main component of soap scum, a white solid that forms when soap is mixed with hard water.
Calcium and magnesium soaps are most commonly encountered as soap scum but the pure materials have a variety of uses. Magnesium stearate and calcium stearate are used as excipients , lubricants, release agents , and food additives , with the later use being covered by the generic E numbers of E470b and E470 respectively.
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A spray a day keeps the soap scum away. For premium support please call: 800-290-4726 more ways to reach us