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

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Question

(D) The gold number is defined as the minimum amount of protective colloid in $mg$ that must be added to $10 \, mL$ of a standard gold sol to prevent

Vedclass · Accepted Answer

$250$

Vedclass · Answer

(D) The gold number is defined as the minimum amount of protective colloid in $mg$ that must be added to $10 \, mL$ of a standard gold sol to prevent its coagulation when $1 \, mL$ of $10\% \, NaCl$ solution is added to it.Given that the amount of starch required is $0.25 \, g$.Converting this to milligrams: $0.25 \, g = 0.25 	imes 1000 \, mg = 250 \, mg$.Since this amount of starch prevents the coagulation of $10 \, mL$ of gold sol,the gold number of starch is $250$.

On addition of $1 \, mL$ solution of $10\% \, NaCl$ to $10 \, mL$ gold sol in the presence of $0.25 \, g$ of starch,the coagulation is just prevented. What is the gold number of starch?

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