Question

Which method is used for preparing arsenic sulphide sol?

Answer 1

Hint: Lyophobic Colloids are made up of phases that do not interact with one another.
The dispersion media do not dissolve the dispersed process in lyophobic colloids. Mechanical agitation is used to prepare lyophobic colloids, which is necessary due to the high interfacial energy of the dispersed particles.

Complete answer:
Lyophobic Colloids are made up of phases that do not interact with one another.
The dispersion media do not dissolve the dispersed process in lyophobic colloids. Mechanical agitation is used to prepare lyophobic colloids, which is necessary due to the high interfacial energy of the dispersed particles.
Thermodynamically, lyophobic colloids are unstable. Their scattered particles have a proclivity for coalescence or aggregation. Thermodynamic stability of lyophobic colloids can be improved by adding a small amount of surfactants and lowering the system's interfacial capacity. Lyophobic aerosols and most water-based colloids with an inorganic dispersed form.
A chemical reaction in which a molecule of water is applied to a substance is known as hydrolysis. When this happens, both the material and the water molecule will break into two. One fragment of the target molecule (or parent molecule) gains a hydrogen ion in such reactions.
Arsenious sulphide ($As_2S_3$) is a lyophobic colloid. It is formed when $As_2O_3$ (arsenious oxide) is hydrolyzed in boiled distilled water. More H₂S gas is injected into the solution. The following is the reaction:
\[A{s_2}{O_3}\; + {\text{ }}3{H_2}O{\text{ }} \to {\text{ }}2As{\left( {OH} \right)_3}\]
\[2As{\left( {OH} \right)_3}\; + {\text{ }}3{H_2}S{\text{ }} \to {\text{ }}A{s_2}{S_3}\; + {\text{ }}6{H_2}O\]
The HS ions produced by the dissociation of H₂S surround the particles in Arsenious sulphide colloidal solution. H⁺ ions surround the sulphide ion sheet.
Procedure:
Clean a 250 mL conical flask using the steaming out method. Add 0.2 g solid arsenious oxide and 100 mL distilled water to the mixture. Bring the solution to a boil for ten minutes. Separate the hot solution with the aid of a filter pad. Kipp's apparatus is used to transfer $H_2S$ by $As_2O_3$. Because of the formation of $As_2S_3$, the colour of the solution changes to yellow. Slowly heat the sol to expel hydrogen sulphide gas. The filtrate obtained is ‘arsenious sulphide sol.'

Note:
A chemical reaction in which a molecule of water is applied to a substance is known as hydrolysis. When this happens, both the material and the water molecule will break into two. One fragment of the target molecule (or parent molecule) gains a hydrogen ion in such reactions.