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Applications of Colloids

Gold number o...

Question

Gold number of a lyophilic sol is such property that

A

Larger its value, the greater is peptising power

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B

Lower its value, the greater is peptising power

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C

Lower its value, the greater is protecting power

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D

Larger its value, the greater is protecting power

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Solution

The correct option is C Lower its value, the greater is protecting power
Conceptual

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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.

The coagulation of 100 mL of colloidal solution of gold is completely prevented by the addition of 0.25 g of a substance “

X

” to it before the addition of 1 mL of

10 % N a C l

solution. The gold number of “

X

Q. Consider the following statements.
I. The colour of the hydrophobic sol depends on the wavelength of the light scattered by the dispersed particle.
II. The smaller the gold number value of a hydrophilic colloid, the greater is its protective power.
III. The movement of sol particle under an applied electric potential is called electroosmosis.
Which of the above statements are correct?

The protective power of the lyophilic colloids is expressed in terms of gold number a term introduced by Zsigmondy. Gold number is the number of milligrams of the protective colloid which prevent the coagulation of

10

ml of red gold sol. When

1

10

percent solution of sodium chloride is added to it. Thus, smaller the gold number of lyophilic colloid, the greater is the protective power.

On addition of one mL of solution of

10 %

N a C l

10

mL of red gold sol in presence of

0.025

g of starch, the coagulation is just prevented. The gold number of starch is :

Greater being the gold number, lesser being the protective power.

Q. When a Roman numeral of smaller value is put between two numbers of greater value, it is subtracted from the numeral on its __________.

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