Answer:
Soap is sodium salt of higher fatty
acids (RCOONa). On adding common salt, \[N{{a}^{+}}\] ion concentration
increases. Hence, the equilibrium \[RCOONa(s)\rightleftharpoons
\,RCO{{O}^{-}}+N{{a}^{+}}\] shifts in the backward direction, i.e., soap precipitates
out.
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