In your soap synthesis, you added a solution of sodium chloride and then cooled the reaction...

In your soap synthesis, you added a solution of sodium chloride and then cooled the reaction mixture in order to make the soap precipitate. How does cooling the solution help the soap to precipitate?

I think the answer involves solubility???

Expert Solution

Soap is produced by the saponification of a triglyceride. The triglyceride is reacted with a strong base such as sodium to produce glycerol and fatty acid salts (soap).

Triglyceride + base ---> Soap + Glycerol

The soap formed remains in the form of suspension. To recover this soap, sodium chloride is added to the boiling soap solution. The solubility of an ionic compound decreases in the presence of a common ion. The dissolved soap precipitates out due to the common ion effect of Na⁺ The increased concentration of Na⁺ in the solution due to the dissociation of NaCl, shifts the equilibrium towards left and thus soap is precipitated. The recovery of a dissolved salt by adding another salt to the solution is termed salting out.

queen_honey_blossom answered 2 years ago

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In your soap synthesis, you added a solution of sodium chloride and then cooled the reaction...

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