Comprehension
Lyophilic sols are more stable than lyophobic sols. This is due to
philic colloids are extensively solvated, i.e., colloidal particles are
sheath of the liquid in which they are dispersed.
Lyophilic colloids have a unique property of protecting lyophobic
lyophilic sol is added to the lyophobic sol, the lyophilic particles
lyophobic particles and thus protect the latter from electrolytes. L
used for this purpose are called protective colloids
Answer the followings
xix. Which type of colloids are stable in nature?
XX. Define lyophilic colloids.
xxi. Which type of colloids undergo solvation?
xxii. What are protective colloids?
1
Answers
Answer:
In general, lyophilic sols are more stable than lyophobic sols. The additional stability is due to the presence of an envelope of the solvent (say water) around the colloidal particle. The process is known as hydration. To coagulate a hydrophilic sol, we have to add a dehydrating agent in addition to an electrolyte
Answer:
Lyophilic colloids are liquid-loving colloids (Lyo means solvent and philic means loving). When these colloids are mixed with a suitable liquid, the high force of attraction exists between colloidal particles and liquid. This results in the formation of a very stable solution called lyophilic sol.
Lyophilic colloid: Lyophilic means liquid loving. Substances which when mixed with a suitable liquid as dispersion medium directly results in the formation of the colloidal sol (sols have solid dispersed phase and liquid dispersion medium) are called lyophilic colloids.
Lyophilic Sols:-
the dispersed phase has great affinity for the dispersion medium that results in the extensive solvation of the colloidal particles. In such solids, the dispersed phase does not easily precipitate and the sols are quite stable. These sols are reversible in nature.
A protective colloid is a lyophilic colloid that when present in small quantities keeps lyophobic colloids from precipitating under the coagulating action of electrolytes