0.025 g of starch sol is required to prevent the coagulation of 10 mL – InterviewSolution

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1.	0.025 g of starch sol is required to prevent the coagulation of 10 mL of gold sol when 1 mL of 10% NaCl solution is aded. What is the gold number of starch sol ?
Answer» SOLUTION :Amount of starch sol needed to PREVENT the coagulation of gold sol = 0.025 g = 25 mg. By DEFINITION, this REPRESENTS the gold NUMBER. Thus, gold number of starch = 25

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