2. Classify the following as lyophilic sols and lyophobic sols.
Gold sol, starch sol, gum sol, ferric hydroxide sol, Al(OH), sol.
Answers
Lyophilic sol - gum sol , starch .
Lyophobic Sol - gold sol , ferric hydroxide , Al(OH)
Lyophilic sol - If colloids have strong affinity between particles of dispersed phase and dispersion medium, they are called as lyophilic sols. eg - gum, starch , gelatin etc.
Lyophobic Sol - If the dispersed phase and the dispersion medium repul each other , the colloidal is called a lyophobic sol. eg- gold Sol, ferric hydroxide etc.
Lyophilic and Lyophobic sols
Explanation:
Colloids
They are the type of solution in which particle size is intermediate that is ranging from 1nm-100nm .
It has dispersion phase and dispersion medium .
The colloids are of two types (depending upon whether the dispersed phase have attraction for dispersion medium or not .
- Lyophilic sols
- Lyophobic sols
Lyophilic sols
In this the dispersed phase and dispersion medium have affinity for each other .
Lyophobic sols
In this the dispersed phase and dispersion medium do not have affinity for each other .
Let us classify the above given substances as lyophilic and lyophobic :
Gold sol-Lyophobic
starch sol-lyophilic
gum sol-lyophilic
ferric hydroxide sol-lyophobic
Al(OH)₃-lyophobic