What happens when :
(a) freshly prepared precipitate of `Fe(OH)_(3)` is shaken with a small amount of `FeCl_(3)` solution
(a) persistent dialysis of a colloidal solution is carried out
(c ) an emulsion centrifuges ?

Explanation

(a) `Fe^(3+)` ions `FeCk_(3)`are addsorbed on the surface of `Fe(OH)_(3)` precipitate and as a result, a reddish brown colloured colloidal solution is formed.
`" "underset("Precipitate")(Fe(OH)_(3))+underset("Electrolyte")(Fe^(3+))to underset("Colloidal solution")([Fe(OH)_(3)]`
This is known as pertisation.
(b) As a pf persistend dialysis of colloidal solution, the traces of electrolyte which stabilises the colloidal solution are removed. The colloidal solution (sol) becomes unstable and gets coagulated.
(c ) The emulsion breasks into constituent liquids and this process is known as demulsifiction.