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

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

Vedclass · Accepted Answer

$25$

Vedclass · Answer

(D) The 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 a $10 \% \ NaCl$ solution is added to it.Given mass of starch = $0.025 \ g = 25 \ mg$.Since $25 \ mg$ of starch prevents the coagulation of $10 \ mL$ of gold sol,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 $0.025 \ g$ of starch,the coagulation is just prevented. What is the gold number of starch?

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