What is lyophilic colloid coagulation?

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Lyophilic colloid:
When the colloidal particles are settled down as a precipitate, this phenomenon of colloidal solutions is known as Coagulation.
Lyophilic colloids are very stable.
There is a strong attraction between the dispersed phase as well as dispersion medium
Factors that cause coagulation of sols:
Addition of electrolyte: When a small amount of electrolyte is added to the sol, coagulation can occur.
Addition of solvent: By adding a suitable solvent such as alcohol as well as acetone is added to hydrophilic sols, the dehydration of the dispersed phase occurs.

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Q. 0.25 g lyophilic colloid is added to 100 ml gold solution to prevent the coagulation on adding 1 ml 10% NaCl solution. What will be gold number of lyophilic colloid?

0.25 g lyophilic colloid is added to 100 ml gold solution to prevent the coagulation from adding 1 ml 10% NaCl solution. What will be a gold number of lyophilic colloids?

Q. What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on addition of small amounts of electrolytes?

Q. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols.
Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.
Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a

10 %

solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.

[A g I] I^{-}

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[A g I] I^{-}

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A g N O_{3}, P b (N O_{3})_{2}

F e (N O_{3})_{3}

as (in moles):

Q. 0.25 gm pf colloidal is added yo 100ml gold solution to prevenf the coagulation on adding 1 ml 10%NaCl solution. What will be the gold number pf lyophillic colloid

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