1. Alum is basically the potassium aluminum sulphate [KAl(SO4)2].
2. When dissolved in alkaline bicarbonate it forms a gelatinous precipitate.
3. When added to water it attracts colloidal particles and settles at the bottom of the vessel.
1. Alum is basically the potassium aluminum sulphate [KAl(SO4)2].
2. When dissolved in alkaline bicarbonate it forms a gelatinous precipitate.
3. When added to water it attracts colloidal particles and settles at the bottom of the vessel.