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Define gold number

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Define gold number

Posted by Shashank Sharma 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

G K 7 years, 3 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 colour change from red to violet of 10ml gold sol by the addition of 1 ml of 10%NaCl solution. Coagulation of gold sol is indicated by colour change from red to blue/purple when particle size just increases. More is the gold number, less is the protective power of the lyophilic colloid since it means that the amount required is more.

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