Question

what are lyophilic and lyophobic colloids explain with one example of each.

Answer 1

Lyophilic colloids                                          

• the colloids which have high affinity towards the liquid they are dispersed in.
• The colloids are quite stable and thus no need of stabilizing agent
• The colloids can be reversed by simple mixing if the phases are somehow separated.
• Example: Soaps

Lyophobic Colloids

• the colloids which have zero or low affinity towards the liquid they are dispersed in.
• The colloids are unstable and thus a stabilization agent is required.
• The colloids cannot be reversed by simple mixing if the phases are separated

• Example:Gold Sol

Answer 2

Lyophilic colloids: Liquid loving colloids which creates a sol are called as lyophilic sol.

Properites:                      

• High affinity.
• Stable
• No stabilizing agent
• Reversible
• Eg: Sols of gum, gelatine, starch, proteins and certain polymers in organic solvents

Lyophobic Colloids: Liquid hating colloids which creates a sol are called as lyophobic sol.

Properties:

• Zero affinity.
• Unstable.
• Stabilizing agent required.
• Irreversible.
• Eg: Sols of metals and their insoluble compounds like sulphides and oxides