The coagulation of 100ml gold sol is completely prevented by adding 0. – InterviewSolution

1.	The coagulation of 100ml gold sol is completely prevented by adding 0.25g of starch to it before adding 10ml of 10% NaCl solution. Calculate the gold number of starch.
Answer» Solution :10ml of 10% NaCl solution is added to 100ml of gold SOL. THUS, 1ml of 10% NaCl has been added to each 10ml of gold sol. Weight of starch REQUIRED for 100ml gold sol=0.25g =250MG and in 10ml sol=25mg. Gold number of starch =25.

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