We know that Gold number is the minimum amount of protective (lyophilic) colloid in milligrams which prevents the coagulation or flocculation of 10 ml of standard hydro gold sol by the addition of 1 ml of 10% NaCl solution.
The concept of gold number was given by Zsigmondy.
As par Questions 700 ml of gold solution requires (0.35gm ) or 350 mg of starch.
Hence the amount of lyophilic colloid in mg to protect 10 ml of gold solution is starch =(350×10)÷ 700=5 mg
"Gold number is 5"
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