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Protection of colloids
Concepts tested here
- Gold number
All Questions
2012 AIPMT-PRE 1 question
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The protecting power of lyophilic colloidal sol is expressed in terms ofLyophilic sols protect lyophobic sols from coagulation by electrolytes.
This protecting power is measured by the gold number: the minimum mass in milligrams of the protective colloid that just prevents the coagulation of 10 mL of a gold sol on adding 1 mL of 10% NaCl solution.
The smaller the gold number, the greater the protecting power.