Question

Gold number is used to show​

Answer 1

Answer:

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. It was first used by Richard Adolf Zsigmondy.

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Answer 2

Gold number is used to show​ the protective power of a colloid.

Explanation:

• Gold number is the measure of the protective power of lyophilic colloids.
• It can be defined as the minimum amount of protective colloid (in milligrams) which prevents the coagulation of $10 ml$ of the gold solution when $1 ml$ of $\[10\% \]$ $NaCl$ solution is added to it.
• According to Zsigmondy, the lesser value of the gold number will result in the more protective power of the colloid to prevent coagulation.
• Generally, lyophobic colloids are protected by lyophilic colloids.
• Gelation is considered to be the best protective colloid due to its lowest gold value.

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