If 1 mL of 10% NaCl solution is added to 10 | vedclass

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

Vedclass · Accepted Answer

$250$

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(D) The gold number is defined as the minimum amount of protective colloid in milligrams 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.Given: Mass of starch = $0.25 \ g = 250 \ mg$.Since $250 \ mg$ of starch is required to prevent coagulation in $10 \ mL$ of gold sol,the gold number of starch is $250$.

If $1 \ mL$ of $10\% \ NaCl$ solution is added to $10 \ mL$ of gold sol containing $0.25 \ g$ of starch to prevent coagulation,what is the gold number of starch?

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