Explain : A freshly formed precipitate of ferric hydroxide can be converted to a colloidal sol by shaking it with a small quantity of ferric chloride.

Freshly prepared precipitate sometimes gets converts colloidal solution by ___________ .

Freshly Prepared precipitates can be easily dispersed by shaking it with dispersion medium. This process is called

Peptizing agent is added to convert precipitate into colloidal solution. Explain.

Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

Which of the following is most effective in causing the coagulation of ferric hydroxide sol?

What happens when ferric chloride is added to sodium hydroxide solution, which type of sol is formed?

When HCI reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride.Why?

The particles of colloidal solution possess electrical charge which is responsible for the stability of these solutions. The charge on colloidal particles arises because of selective adsorption of ions which are common with their own lattice. The presence of charge on colloidal part!cles can be determined with the help of phenomenon known as electrophoresis. However, when some electrolyte is added, the charge on the particles of dispersed phase gets neutralized and precipitation takes place. This process is also called coagulation. The coagulation is given by Hardy Schulze rules. According to these rules the ions carrying the charge opposite to that of sol particles are effective and coagulating power of an electrolyte is directly proportional to the fourth power of the valency of the ion. Coagulation can also occur by mutual precipitation, by electrophoresis, by persistent dialysis or by heating or cooling. Which charge is responsible for stability of colloidal particles ?

Explain what is observed :- an electrolyte, NaCl is added to hydrated ferric oxide sol.

what is the correct sequence of the decreasing coagultion value of the following electrolyte for the coagultion of ferric hydroxide sol ? (I) Na_(3) PO_(4) (II)KCl (III) K_(2)SO_(4) (IV)K_(4)[Fe(CN)_(6)]