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The coagulation of 100 mL of a colloidal...

The coagulation of `100 mL` of a colloidal solution of gold is completely prevented by the addition of `0.030 g` of it before adding `1 mL` of `10% NaCl` solution. Find out the gold number of starch?

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Starch added to 100 mL of gold sol to completely prevent coagulation by1m of 10% NaCl sol = 0.30 g = 300 mg starch required to be added to 1 or of gold sol to completely prevent coagulation by 1m of 10 Na SOl2
Therefore , by definition gold number of starch =30
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