Arsenous sulphide sol is prepared by passing H2 S through arsenous oxide solution. The charge d

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Arsenous sulphide sol is prepared by passing H2 S through...

Arsenous sulphide sol is prepared by passing $\mathrm{H}_{2} \mathrm{~S}$ through arsenous oxide solution. The charge developed on the particies is due to adsorption of:
(a) $\mathrm{H}^{+}$
(b) $\mathrm{S}^{2-}$
(c) $\mathrm{OH}^{-}$
(d) $\mathrm{O}^{2-}$

Key Concepts

Electrical Double Layer

When ions are adsorbed onto the surface of colloidal particles, they form an electrical double layer consisting of a layer of fixed charges on the particle surface and a diffuse layer of counterions in the surrounding solution. This double layer plays a crucial role in determining the interactions between colloidal particles and contributes significantly to colloidal stability.

Ion Adsorption

Ion adsorption involves the adherence of ions from the surrounding solution onto the surfaces of colloidal particles. This process is fundamental in modifying the surface charge and potential of the particles, which in turn influences the formation of the electrical double layer and the overall stability of the colloid.

Colloidal Suspensions

Colloidal suspensions are mixtures where tiny particles (typically in the nanometer to micrometer range) are dispersed throughout a continuous medium. These particles are small enough to remain suspended due to Brownian motion and are subject to unique interfacial phenomena that differ from those seen in bulk materials.

Surface Charging in Colloids

The stability of colloidal systems often hinges on the charge present on the surface of dispersed particles. This surface charge prevents aggregation by creating electrostatic repulsion between particles, thereby maintaining the dispersion. The development of this charge is typically due to the adsorption of ions from the surrounding medium.

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