The coagulation of 10 ml of a colloidal gold sol is completely prevented by addition of 0.025 g of to it before adding 10 ml of 10% NaCl solution. What is the gold number of starch?
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By definition gold number of starch is the amount of starch in mg added to 10 ml standard gold sol which prevents the coagulation of gold on adding 1 ml of 10% NaCl solution. So the amount of starch is 0.25g = 250 mg.
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