100 , cm^3 of gold sol requires 10^{-4} , g o | vedclass

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(D) The gold number is defined as the minimum amount of protective colloid in milligrams $(mg)$ required to prevent the coagulation of $10 \, mL$ of a

Vedclass · Accepted Answer

$0.01$

Vedclass · Answer

(D) The gold number is defined as the minimum amount of protective colloid in milligrams $(mg)$ required to prevent the coagulation of $10 \, mL$ of a standard gold sol when $1 \, mL$ of $10 \% \, NaCl$ solution is added. Given that $100 \, cm^3$ of gold sol requires $10^{-4} \, g$ of gelatin. Therefore,$10 \, cm^3$ of gold sol requires $\frac{10^{-4}}{10} \, g = 10^{-5} \, g$ of gelatin. Converting $g$ to $mg$: $10^{-5} \, g = 10^{-5} 	imes 10^3 \, mg = 10^{-2} \, mg = 0.01 \, mg$. Thus,the gold number of gelatin is $0.01$.

$100 \, cm^3$ of gold sol requires $10^{-4} \, g$ of gelatin to prevent coagulation when $1 \, cm^3$ of $10 \% \, NaCl$ solution is added. The gold number of gelatin is ............ .

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