0.25 g lyophilic colloid is added to 100 ml gold solution to prevent the coagulation on adding 1 ml 10% Solution. What will be the gold number of lyophilic colloid?
Step 1: Gold number formula
Given: 0.25 g lyophilic colloid is added to 100 ml gold solution
i.e. 250mg lyophilic colloid is added to 100 ml gold solution.
The gold number is defined as the minimum amount of protective colloid in milligrams which prevents a color change from red to the violet of 10ml gold solution by addition of 10ml of 1% solution.
Step 2: Calculating the gold number
Amount of lyophilic colloid added to 1ml gold solution =
Amount of lyophilic colloid added to 10ml gold solution =
Hence, the gold number of the lyophilic colloid is 25.