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Which of the following method is not employed for the purification of colloids?

(a) Electrodialysis

(b) Dialysis

(c) Ultracentrifugation

(d) Peptisation

1 Answer

  • Electrodialysis (ED) is used to transport salt ions from one solution through ion-exchange membranes to another solution under the influence of an applied electric potential difference.
  • Dialysis is the process of separating molecules in solution by the difference in their rates of diffusion through a semipermeable membrane, such as dialysis tubing. The most common application of dialysis is for the removal of unwanted small molecules such as salts, reducing agents, or dyes from larger macromolecules such as proteins, DNA, or polysaccharides.
  • Ultracentrifugation, involves separation on the basis of the centrifugal force created by very rapid rotation (50,000 revolutions per minute or more). Different species, depending on their masses, will settle at different speeds under these conditions.
  • Peptization is the process responsible for the formation of stable dispersion of colloidal particles in dispersion medium.
Answer: Peptisation
Peptisation is the process of connverting freshly prepared precpitates into colloidal solution.


answered Dec 14, 2013 by mosymeow_1