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

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.

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10ml of `10% NaCl` solution is added to 100ml of gold sol. Thus, Iml 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 10 ml sol = 25 mg.
Gold number of starch = 25.
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