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What is the actual formula to calculate gold number

What is the actual formula to calculate gold number

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A)
Gold Number is a term used in colloidal chemistry . It is defined as the minimum amount of protective colloid  in milligrams which change the colour from red to violet of 10ml gold solution by the addition of 1ml.10% NaCl solution

More is the gold number less is the protective power of the lyophilic colloid since it means that the amount required is more.The amount is taken in terms of weight in milligrams.
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