Explain the following observation: a. Lyophilic colloid is more stable than lyophobic colloid. b. Coagulation takes place when sodium chloride solution is added to a colloidal solution of ferric hydroxide. c. Sky appears blue in colour.
Text Solution
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a. In is due to the greater force of attraction between dispersed phase and dispersion medium in lyophilic colloid that lyophobic colloid. b. `Fe(OH)_(3)` sol is positively charged which is coagulated by negatively charged `Cl^(ɵ)` present in sodium chloride solution. c. Sky appears blue in colour due to the scattering of light by colloidal particles. This is known as Tyndall effect.
What is observed when sodium chloride is added to a colloidal solution of ferric hydroxide?
Assertion: Lyophilic colloids are more stable than lyophobic colloids. Reason: In lyophobic system, the dispersed particles are more solvated than in lyophilic system.
Explain the following observation: a. A beam of light passing through a colloidal solution has a visible path. Passing an electric currenet through a colloidal solution removes colloidal particles from it. c. Ferric hydroxide sol coagulates on addition of potassium sulphate.
