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

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

Vedclass · Accepted Answer

$25$

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(D) The gold number is defined as the minimum amount of protective colloid (in $mg$) that is required to prevent the coagulation of $10 \, mL$ of a standard gold sol when $1 \, mL$ of a $10\% \, NaCl$ solution is added.Given that the mass of starch used is $0.0250 \, g$.To convert this mass into milligrams $(mg)$: $0.0250 \, g 	imes 1000 \, mg/g = 25 \, mg$.Therefore,the gold number of starch is $25$.

On addition of $1 \, mL$ solution of $10\% \, NaCl$ to $10 \, mL$ gold sol in the presence of $0.0250 \, g$ of starch,the coagulation is just prevented. What is the gold number of starch?

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