what is gold number
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Gold Number is a term used in colloidal chemistry. It is defined as the minimum amount of protective colloid in milligrams which prevents a color change from red to violet of 10ml gold sol by the addition of 1 ml of 10%NaCl solution.
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Zigmondy introduced the term gold number to evaluate quantitatively the protective power of different lyophilic colloids. It may be defined as ‘least quantity of protective colloid in milligrams, which is just sufficient to prevent the coagulation of 10 ml of standard gold sol (containing 0.0053% gold) by the rapid addidition of 1 ml of 10% NaCl solution. The Coagulation of gold sol is indicated by change in color from red to violet. Thus small the gold number, the greater is protective power of lyophilic colloid.
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Zigmondy introduced the term gold number to evaluate quantitatively the protective power of different lyophilic colloids. It may be defined as ‘least quantity of protective colloid in milligrams, which is just sufficient to prevent the coagulation of 10 ml of standard gold sol (containing 0.0053% gold) by the rapid addidition of 1 ml of 10% NaCl solution. The Coagulation of gold sol is indicated by change in color from red to violet. Thus small the gold number, the greater is protective power of lyophilic colloid.
hope it's helpful.
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