Question

why lyophobic sol is called irreversible sol?​

Answer 1

Answer:

The colloidal sollution in which the particles of the dispersed phase have little affinity towards the dispersion medium, it is called a lyophobic sol.

In lyophobic sol, weak force of interaction exist between colloidal particles and liquid ,

hence, lyophobic sols are less stable and irreversible. as irreversible  sol is thermodynamically unstable .

Answer 2

• If the dispersed medium in lyophilic colloids is removed from the dispersion media, the sol can still be created by simply mixing the two together. As a result, they are known as reversible sols. Lyophobic sols rapidly precipitate when a modest amount of electrolyte is added; they do not return to the colloid when the dispersion medium is just added. They are hence known as irreversible sols.
• Because the dispersed phase in this kind of colloidal system does not have a strong affinity for the dispersion medium, the colloid does not form easily. Since they cannot be rebuilt by merely adding dispersion medium after precipitation, they are also referred to as irreversible sols. They are unstable and easily coagulate when heated, shaken, or added electrolyte. Special techniques can be used to prepare lyophobic colloids, which also need a stabilising ingredient. Metals and their soluble compounds like sulphides are examples of lyophobic colloids.

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