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Friday, May 22, 2020

What is Gold number of protective colloidal solution?

Lyophilic sols are more stable than lyophobic sols.this is due to the fact that lyophilic colloids are extensively solvated, i.e. colloidal particles are covered by a sheath of the liquid in which they are dispersed.

Lyophilic colloids have a unique property of protecting lyophobic colloids. When a lyophilic sol is added to the lyophobic sol, the lyophilic particles form a layer around lyophobic particles and, thus, protect the latter from electrolytes.

Lyophilic colloids used for this purpose are called protective colloids.

The lyophilic colloids differ in their protective power. The protective power is measured in terms of Gold Number and is defined as the number of milligrams of a lyophilic colloid that will just prevent the precipitation
of 10 ml of a gold sol on the addition of 1 ml of 10% sodium chloride solution.

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