JEE Advanced · ChemistryHard
Which of the following statements regarding the zeta potential of a colloidal system is correct?
- A.It is the potential difference between the bulk liquid and the stationary layer of fluid attached to the dispersed particle.
- B.It is the potential difference between the surface of the particle and the bulk liquid.
- C.It is always equal to the Nernst potential.
- D.It is independent of the concentration of electrolytes in the medium.
Show correct answer & step-by-step solution
Correct answer: A — It is the potential difference between the bulk liquid and the stationary layer of fluid attached to the dispersed particle.
Solution
- The electrical double layer consists of a Stern layer and a diffuse layer.
- The potential drops across the Stern layer and the diffuse layer.
- The zeta potential is the potential at the shear plane (slipping plane) relative to the bulk.
- This plane separates the stationary fluid layer from the bulk fluid.
- Hence the answer is (A).
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