A sol is prepared by addition of excess of AgNO3 solution in KI solution. The charge likely to d

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A sol is prepared by addition of excess of AgNO3 solution in...

A sol is prepared by addition of excess of $\mathrm{AgNO}_{3}$ solution in KI solution. The charge likely to develop on colloidal particles is:
(a) positive
(b) negative
(c) no charge
(d) both charges

Key Concepts

Colloidal Sol Formation

A colloidal sol is a dispersion system in which minute particles are dispersed in a continuous medium. These particles are typically between 1 nm and 1000 nm in size and remain suspended due to a combination of factors including Brownian motion and repulsive forces that prevent aggregation.

Surface Charge Development

The surfaces of colloidal particles often acquire charge through the adsorption of ions from the medium. This charge plays a crucial role in stabilizing the colloid, as like-charged particles repel each other, preventing flocculation and aggregation of the dispersed particles.

Effect of Excess Reagent

In reactions leading to the formation of colloidal sols, the use of an excess of one reagent can result in the adsorption of surplus ions onto the surface of the forming particles. This adsorption imparts a net charge to the particles, which is typically reflective of the type of ion in excess, thereby influencing the overall charge of the colloidal particles.

Electric Double Layer

Once a colloidal particle gains a surface charge, it attracts a layer of oppositely charged ions from the surrounding medium, forming what is known as the electric double layer. This structure, consisting of a compact layer of adsorbed ions and a diffuse layer of counterions, is essential for the electrostatic stabilization of colloids.

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