On addition of 1 mL of 10 % NaCl to 10 mL g | vedclass

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

Vedclass · Accepted Answer

$38$

Vedclass · Answer

(B) The gold number is defined as the minimum amount of protective colloid in milligrams that prevents the coagulation of $10 \ mL$ of a gold sol when $1 \ mL$ of $10 \%$ $NaCl$ solution is added to it.Given mass of starch = $0.038 \ g = 38 \ mg$.Since $38 \ mg$ of starch prevents the coagulation of $10 \ mL$ of gold sol,the gold number of starch is $38$.

On addition of $1 \ mL$ of $10 \%$ $NaCl$ to $10 \ mL$ gold sol in the presence of $0.038 \ g$ of starch the coagulation is just prevented. Then the value of gold number of starch is

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