Define gold number
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Amar Kumar 7 years, 8 months ago
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.
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 addition of 1 ml of 10% NaCl solution. Thus small the gold number, the greater is protective power of lyophilic colloid.
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