In the precipitation of soap (like sodium stearate, ) from its saturated aqueous solution, which compound is typically added to drive the equilibrium backward via the common ion effect?

Question

In the precipitation of soap (like sodium stearate, $C_{17}H_{35}COONa$) from its saturated aqueous solution, which compound is typically added to drive the equilibrium backward via the common ion effect?

Prashant Kotian · Accepted Answer

Correct answer: B. Soap dissolves according to the equilibrium . Adding a strong electrolyte like drastically increases the concentration. Because of the common ion effect, the ionic product exceeds the of the soap, shifting the equilibrium backward and causing the soap to precipitate out (salting out).

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