Question

How can a lyophobic sol be protected against coagulation caused by an electrolyte?

Answer 1

A lyophobic sol can be protected against coagulation by adding a small amount of a lyophilic sol, such as gelatin, starch, or gum arabic. These lyophilic substances form a protective layer around the lyophobic colloidal particles, preventing them from aggregating when an electrolyte is added. This protective layer reduces the impact of the added ions and stabilizes the colloidal solution.