Question

This phenomenon is observed when a saturated salt solution reduces the solubility of soap from a basic solution

Answer 1

Answer:

The solubility of sodium soaps in dilute aqueous salt solutions has been systematically investigated by direct visual phase behavior observations. The added electrolytes, including simple inorganic salts and bulky organic salts, influence the solubility of sodium soaps in water, as represented by the varied soap Krafft point. Two inorganic salts, sodium chloride and sodium perchlorate, demonstrate a "salting-out" property. On the other hand, tetraalkylammonium bromides show an excellent ability to depress the soap Krafft point and enhance the soap solubility in water. With increasing the tetraalkylammonium ionic size, the degree of "salting-in" of soaps in water increases. However, solubility of pure tetraalkylammonium bromide in water decreases as the length of the alkyl chains increases. Furthermore, in the ternary water-tetrapentylammonium bromide (TPeAB)-sodium myristate (NaMy) system, we observed an upper cloud point phenomenon, which greatly shrinks the 1-phase micellar solution region in the phase diagram. This miscibility gap, together with the organic salt solubility limitation, restricts the use of tetraalkylammonium bromides with alkyl chains longer than 4 carbon atoms as effective soap solubility enhancement electrolytes. We also found that for sodium soap with a longer hydrocarbon chain, more tetrabutylammonium salt is required to reduce the soap Krafft point to room temperature.

Explanation:

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Answer 2

Answer:

The solubility of the soap decreases when common salt is added to a saturated solution of soap. This further helps in the precipitation.

Explanation:

When common salt is added to the saturated solution of soap, it decreases the solubility of the soap. Addition of salt i.e., sodium chloride reduces soap's solubility and the precipitation will occur due to the presence of sodium and chloride ions which leads to common ion effect.

The addition of some electrolytes such as simple inorganic salts as well as bulky organic salts effects the solubility of sodium soaps in water.

Thus, on adding salt to soap solution the solubility will decrease.

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