Question

Give two differences between lyophilic colloids and lyophobic colloids.

Answer 1

Hint: Lyophobic colloids are colloids that hate liquids while lyophilic colloids are those colloids that love liquids.

Complete step by step answer:
-First let us see what they are differently then we will differentiate between them:
  Lyophobic colloids: Here ‘Lyo’ means ‘solvent’ and ‘phobic’ means ‘to hate’. They are those colloids which hate liquids. When mixed with suitable liquids these colloids form a weak force of attraction with the liquid and thus such a system does not pass into the colloidal state easily.
  Lyophilic colloids: Here ‘Lyo’ means ‘solvent’ and ‘philic’ means ‘to love’. These are those colloids which love liquids. When mixed with suitable liquids these colloids form strong bonds or strong forces of attraction with the liquid and thus this system has the ability to pass into a colloidal state easily.
-Now let’s see the difference between both of them:
  But first keep in mind that here colloid is the dispersion phase and the liquid is the dispersion medium.

Lyophilic colloids (liquid loving colloids)	Lyophobic colloids (liquid hating colloids)
1) Strong forces of attraction exist between the liquid and the colloidal particles.	1) The forces of attraction between the liquid and the colloidal particles are weak.
2) Dispersion phase has high affinity for dispersion medium.	2) Dispersion phase has low affinity for dispersion medium.
3) They are easily prepared by simply mixing the colloid with the liquid.	3) They are prepared by using special methods and during these processes additional stabilizers are added.
4) Strong forces of attraction make them highly stable and cannot be easily coagulated.	4) They are less stable due to the weak forces of attraction and can be easily coagulated (by adding suitable electrolyte).
5) They are reversible because after evaporation of the liquid, the residue can be converted back to liquid by just adding more liquid to it.	5) They are irreversible because on evaporation of the liquid, the residue left cannot be converted back to colloid by just adding more liquid.
6) Charge depends on the pH of the solution so it can be positive, negative or neutral also.	6) Charge can be positive or negative.
7) Their viscosity is higher than that of dispersion medium.	7) Their viscosity is the same as that of the medium.
8) Their surface tension is lesser than that of the dispersion medium.	8) Their surface tension is the same as that of the dispersion medium.
9)Example: organic substances like starch, proteins, gums, gelatine, etc.	9)Example: inorganic substances like iron ($Fe{(OH)_3}$), arsenic ($A{s_2}{S_3}$), etc.

Although the question has asked for only 2 differences, it is important for you to learn the entire concept and so I have provided you with all the basic information u might need.

Note: The phase that is scattered in the form of colloidal particles is called the dispersion phase, while the medium in which these colloidal particles are dispersed is known as the dispersion medium.