Advertisements
Advertisements
Question
Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol? Give reason.
Advertisements
Solution
According to the Hardy–Schulze rule, the greater the valency of a flocculating ion, the greater is its power to cause precipitation. Between Ba2+ (from BaCl2) and K+ (from KCl), Ba2+ has greater valency. Therefore, BaCl2 will be more effective in causing the coagulation of a negatively charged colloidal sol.
APPEARS IN
RELATED QUESTIONS
Define the following terms: Associated colloids
Give reasons for the following observations:
Brownian movement provides stability to the colloidal solution.
Explain what is observed when an electric current is passed through a colloidal sol?
Explain the term Electrophoresis
What happens when an emulsion is centrifuged?
Which of the following statements are correct?
(i) Mixing two oppositely charged sols neutralises their charges and stabilises the colloid.
(ii) Presence of equal and similar charges on colloidal particles provides stability to the colloids.
(iii) Any amount of dispersed liquid can be added to emulsion without destabilising it.
(iv) Brownian movement stabilises sols.
Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?
(i) Reverse osmosis takes place.
(ii) Electroosmosis takes place.
(iii) Dispersion medium begins to move.
(iv) Dispersion medium becomes stationary.
Assertion: An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.
Reason: Pore size of the filter paper becomes more than the size of colloidal particle.
Which of the following is used for removing change on colloidal solution?
What is electrophoresis?
