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The coagulation of 10mL of a colloidal g...

The coagulation of `10mL` of a colloidal gold solution is prevented by the addition of `0.024g` of a compound followed by `10mL` of `1%` solution of soldium chloride. The gold number of the compound is

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10 ml of 10% NaCl solution is added to 100 ml of gold sol. Thus, 1 ml of 10% NaCl has been added to each 10 ml of gold sol.
Weight of starch required for 100 ml gold sol = 0.25 g = 250 mg
Weight of starch and in 10 ml sol = 25 mg.
Gold number of starch = 25.
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