Advertisements
Advertisements
Question
Give reasons for the following observations: Leather gets hardened after tanning.
Advertisements
Solution
Animal skin (hide) is colloidal in nature and has positively charged particles, whereas tanning consists of negatively charged colloidal particles. When a hide is soaked in tanning, mutual coagulation takes place and as a result, leather gets hardened.
APPEARS IN
RELATED QUESTIONS
Define the following term : Brownian movement
Explain what is observed when an electrolyte NaCl is added to hydrated ferric oxide sol.
Explain the terms Dialysis
Explain the term Tyndall effect.
The values of colligative properties of colloidal solution are of small order in comparison to those shown by true solutions of same concentration because of colloidal particles ______.
Why do we add alum to purify water?
Assertion: Coagulation power of Al3+ is more than Na+.
Reason: Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy Schulze rule).
Gold number of protective colloids A, Band Dare 0.50, 0.01 and 0.10 and 0.005. The correct order of their protecting power is
The right option for the statement “Tyndall effect is exhibited by”, is:
Define coagulation.
