What is lyophilic and lyophobic sols give one example of each type. which one of these two types of sols is easily coagulated and why?
Answers
Lyophilic sols Colloidal sols directly formed by mixing substances in a suitable dispersion medium are called lyophilic sols. These are quite stable. These are also known as reversible sols because the dispersion medium can be separated from the colloid by means of physical methods like evaporation. e.g., gum, gelatin, starch, rubber, etc.
Lyophobic sols (Liquid heating) Such sols are not formed by simply
mixing the substances with the dispersion medium. These are not stable, i.-e., these sols are coagulated easily when a small amount of electrolyte is added to them or they: are heated or shaked. These sols need• stabilising agents for their preservation,
Reason for coagulation of hydrophobic sols These sols are
precipitated due to the removal or neutralization of charge on their particles, i.e., they come nearer, form aggregate and settle down, (in other words, coagulation or precipitation occurs.) This is done by addition of a small amount of electrolyte.
Answer:
lyophilic sols and lyphobic sols explanation
