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  4. The coagulation of 10 cm3 of Gold sol is completely prevented by addition of 0.025 g of starch to it. The gold number of starch is

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Q. The coagulation of $10 cm^3$ of Gold sol is completely prevented by addition of $0.025\, g$ of starch to it. The gold number of starch is

Surface Chemistry

Solution:

Gold number is the weight of protective colloid in milligrams which prevents the coagulation of $10\, cm^{3}$ of gold sol
$\therefore $ Gold number of starch $=0.025\times1000$
$=25(mg)$