Give the reason of formatiom of soap with hard water
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Soaps are sodium or potassium salts of higher fatty acids. Hardness in water is due to the presence of Ca^2+ and Mg^2+ ions, present as their salts. The soap first reacts with calcium abd magnesium ions to form insoluble precipitate of calcium and magnesium salts of fatty acids which float as an off- white layer over wated. This layer is called scum.
\begin{lgathered}{Ca}^{2+} \: + 2RCOONa \: --> \\ (RCOO)2 \: + 2 {Na}^{ + }\end{lgathered}Ca2++2RCOONa−−>(RCOO)2+2Na+
\begin{lgathered}{Mg}^{2+} \: + 2RCOONa \: --> \\ (RCOO)2 \: + {2Na}^{ + }\end{lgathered}Mg2++2RCOONa−−>(RCOO)2+2Na+
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\begin{lgathered}{Ca}^{2+} \: + 2RCOONa \: --> \\ (RCOO)2 \: + 2 {Na}^{ + }\end{lgathered}Ca2++2RCOONa−−>(RCOO)2+2Na+
\begin{lgathered}{Mg}^{2+} \: + 2RCOONa \: --> \\ (RCOO)2 \: + {2Na}^{ + }\end{lgathered}Mg2++2RCOONa−−>(RCOO)2+2Na+
HOPE IT HELPS!!
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