Why soaps cannot be used in hard water?
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Why soaps cannot be used in hard water?

Why soaps cannot be used in hard water?
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Why soaps cannot be used in hard water?

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Hard water contains calcium and magnesium ions. These ions on reaction with sodium or potassium soaps form gummy mass which gets adhered onto the fibre of the cloth.

$\begin{array}{l} 2 \mathrm{C}_{17} \mathrm{H}_{35} \mathrm{COONa}+\mathrm{CaCl}_2 \rightarrow 2 \mathrm{NaCl}+ \left(\mathrm{C}_{17} \mathrm{H}_{35} \mathrm{COO}\right)_2 \mathrm{Ca}  \text { [Insoluble calcium } \\\text { stearate (soap)] }\end{array}$

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