On addition of 1 , mL of 10 % , NaCl solution | vedclass

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(B) Gold number is defined as the minimum amount of protective colloid in milligrams that prevents the coagulation of $10 \, mL$ of a standard gold so

Vedclass · Accepted Answer

$25$

Vedclass · Answer

(B) Gold number is defined as the minimum 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 mass of starch $= 0.025 \, g$.Converting mass to milligrams: $0.025 \, g = 0.025 	imes 1000 \, mg = 25 \, mg$.Since this amount of starch just prevents the coagulation of $10 \, mL$ of gold sol,the gold number of starch is $25$.

	Dispersed Phase	Dispersion medium
$1$	liquid	solid
$2$	liquid	liquid
$3$	solid	liquid
$4$	solid	solid

On addition of $1 \, mL$ of $10 \% \, NaCl$ solution to $10 \, mL$ gold sol in the presence of $0.025 \, g$ of starch,the coagulation is just prevented. The gold number of starch is:

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