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The coagulation of 100 ml gold sol is co...

The coagulation of 100 ml gold sol is completely prevented by adding 0.25 g of starch to it before adding 10 ml of 10% NaCl solution. Calculate the gold number of starch.

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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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AAKASH SERIES-SURFACE CHEMISTRY-Objective Excersice - 4 (ASSERTION (A)& REASON (R ) TYPE QUESTION)
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