Question

What happens when a freshly prepared precipitate of $Fe{(OH)_3}$ is shaken with a small amount of $FeC{l_3}$ solution?

Answer 1

Hint: A colloidal dispersion contains a stable, liquid or gaseous debris which is dispersed in a continuous section (which are solid, liquid or gasoline). The term colloidal refers to debris with at least one measurement which starts from\[1nm \;to\; 1\mu m\]. Most usually encountered colloidal dispersions are stable-liquid (known as suspensions), liquid-liquid (known as emulsions), fuel-liquid (known as foams), and solid-fuel (known as aerosols) dispersions.

Complete step by step solution:
When a freshly organized precipitate of $Fe{(OH)_3}$ is shaken with a small amount of $FeC{l_3}$ solution, colloidal dispersion of $Fe{(OH)_3}$ is formed. This manner is referred to as peptization. During peptization, a precipitate is changed into colloidal particles with the aid of adding suitable electrolyte. In the above instance given, $FeC{l_3}$ reaction is acting as a peptizing agent.

Additional information:
Electrophoretic light scattering (ELS) is a common method which is used to assess the ability of dispersion to remain solid. Electrophoretic light scattering lets in determining zeta-ability of a dispersion, which can offer information approximately to electrostatic interactions and, by using extrapolation, to their tendency to agglomerate. The zeta-potential is taken into thought to be a dependable indicator of dispersion stability, nonetheless several parameters consisting of steric results, sedimentation, or hydrophobic effects, can even have a robust influence. In consequence, relying on zeta-capability values simplest can lead to false stability interpretations such as, as a case, with metallic nanoparticles in complex media, aqueous silica sol, and oil in water emulsions.

Note:
Gravitational stability denotes the ability of debris to face up to particle migration(such as Sedimentation or creaming) and mainly be governed by the rheological homes of the colloidal dispersion together with viscosity and density of the continuous segment, length, and density of the debris. For diluted colloidal debris in a Newtonian fluid, this migration phenomenon may be described by means of Stokes law.