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 the gold number of lyophilic colloid?

Open in App

Solution

Step 1: Gold number formula
Given: 0.25 g lyophilic colloid is added to 100 ml gold solution
i.e. 250mg lyophilic colloid is added to 100 ml gold solution.
The gold number is defined as the minimum amount of protective colloid in milligrams which prevents a color change from red to the violet of 10ml gold solution by addition of 10ml of 1% $NaCl$ solution.
Step 2: Calculating the gold number
Amount of lyophilic colloid added to 1ml gold solution = $\frac{250}{100} = 2.5 m g$
Amount of lyophilic colloid added to 10ml gold solution = $= 2.5 \times 10 = 25 m g$

Hence, the gold number of the lyophilic colloid is 25.

Suggest Corrections

Similar questions

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. 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

Q. 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 milligram of the protective colloid which prevents the coagulation of

10 mL

of red gold sol. When

1 mL

of a

10 %

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

The gold number of gelatin is

0.01

. Calculate the amount of gelatin to be added to

1000 mL

of a colloidal sol of gold to prevent its coagulation before adding

1 mL

10 % N a C l

solution.

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

” is

Join BYJU'S Learning Program

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 the gold number of lyophilic colloid?

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 the gold number of lyophilic colloid?