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Question
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 of 10% NaCl solution.
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 of 10% NaCl solution.
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Solution
The correct option is D 1
Gold number of gelatin =0.01.
This means that 0.01 mg gelatin is required to be added to 10 mL of gold sol to completely prevent coagulation of 1 mL of 10% NaCl solution.
Therefore, gelatine added to 1000 mL of gold sol to prevent coagulation =0.01×1000=1 mg.
Gold number of gelatin =0.01.
This means that 0.01 mg gelatin is required to be added to 10 mL of gold sol to completely prevent coagulation of 1 mL of 10% NaCl solution.
Therefore, gelatine added to 1000 mL of gold sol to prevent coagulation =0.01×1000=1 mg.
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