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What is gold number?...

What is gold number?

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On addition of 1 mL solution of 10% NaCl to 10 mL gold sol in the presence of 0.0250 g of starch, the coagulation is just prevented. What is the gold number of starch?

The coagulation of 100 ml of a colloidal solution of gold is completely prevented by addition of 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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50 ml of standard gold sol needs 0.05 mg of gelatine for its protection from coagulation - Calculate gold number of gelatine.

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