To resist the coagulation of 100 cc gold sol | vedclass

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Question

(D) The gold number is defined as the amount of protective colloid in milligrams that prevents the coagulation of $10 \ mL$ of a standard gold sol whe

Vedclass · Accepted Answer

$0.01$

Vedclass · Answer

(D) The gold number is defined as the amount of protective colloid in milligrams that prevents the coagulation of $10 \ mL$ of a standard gold sol when $1 \ mL$ of $10 \% \ NaCl$ solution is added to it.Given that $10^{-4} \ g$ of gelatin is required to protect $100 \ mL$ of gold sol.Convert the mass of gelatin to milligrams: $10^{-4} \ g = 10^{-4} 	imes 1000 \ mg = 0.1 \ mg$.Since $0.1 \ mg$ of gelatin protects $100 \ mL$ of gold sol,the amount of gelatin required to protect $10 \ mL$ of gold sol is:$\frac{0.1 \ mg}{100 \ mL} 	imes 10 \ mL = 0.01 \ mg$.Thus,the gold number of gelatin is $0.01$.

To resist the coagulation of $100 \ cc$ gold sol,$1 \ cc$ of $10 \% \ NaCl$ is added to it in the presence of $10^{-4} \ g$ gelatin. The gold number of gelatin is:

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