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A reddish brown positively charged sol i...

A reddish brown positively charged sol is obtained by adding small quantity of `FeCl_(3)` solution to freshly prepared and well washed `Fe(OH)_(3)` precipitate. How does it take place ?

Text Solution

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It is due to adsorptions of `Fe^(3+)` ions on the surface of `Fe(OH)_(3)` which gives colloidal sol.
`Fe(OH)_(3) (ppt.) + Fe^(3+)` (ions adsorbed) `to [Fe(OH)_(3)]Fe^(3+)` (colloidal sol).
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A reddish positive charged sol is obtained by adding small quantity of FeCl_(3) solution to freshly prepared and well washed Fe(OH)_(3) precipitate. How does it take place?

A reddish brown sol (containing Fe^(3+) ) is obtained by :

In a colloidal state, the particle size of he dispersed phase ranges between 10^(3) to 10^(6) pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. Small amount of ferric chloride (FeCl_(3)) solution is added to freshly prepared and well washed Fe(OH)_(3) precipitate :

Why is Fe(OH)_(3) colloid positively charged when prepared by adding FeCl_(3) to hot water ?

When FeC_3 solution is added to NaOH a negatively charged sol is obtained. It is due to the: