what are lyophilic and lyophobic sols? give one example of each type why are hydrophobic sols easily coagulate?️️
Answers
Explanation:
Lyophilic sols are reversible in nature. They can be prepared again by simply mixing the dispersion medium with the dispersion phase and shaking the mixture. Lyophobic sols are those in which the dispersed phase has no attraction for the dispersion medium or the solvent.
Answer:
In lyophilic sols, the dispersed phase particles have great affinity (or love) for the dispersion medium. These sols are reversible. Examples include gum, gelatin, starch, proteins and rubber etc.
In lyophobic sols, the dispersed phase particles have no affinity (or love) for the dispersion medium. These sols are irreversible. Examples include solutions of metals such as gold and silver, metal hydroxides and metal sulphides.
Hydrophobic sols get easily coagulated because these sols are stabilized due to the charge on the particle. If the charge is removed by adding any suitable electrolyte the particles tend to come closer and form aggregate or precipitate.