Distinguish between Lyophobic and Lyophilic sols.

Lyophobic sols (colloids) :

1. Lyophobic sols are formed only by special methods.

2. They are irreversible. 

3. These are unstable and hence, require traces of stabilizers. 

4. Addition of small amount of electrolytes causes precipitation or coagulation of lyophobic sols. 

5. Viscosity of lyophobic sol is nearly the same as the dispersion medium. 

6. Surface tension of lyophobic sol is nearly the same as the dispersion medium.

Lyophilic sols (colloids) :

1. Lyophilic sols are formed easily by direct mixing. 

2. They are reversible. 

3. These are self-stabilized. 

4. Addition of large amount of electrolytes causes precipitation or coagulation of lyophilic sols. 

5. Viscosity of lyophilic sol is much higher than that of the dispersion medium. 

6. Surface tension of lyophilic sol is lower than that of dispersion medium.