Precipitate is the now insoluble part formed when two chemicals react. Usually a solid, but if the fluid were dense, it may not settle. It could be a colloid. If you added NaCl solution to a AgNO3...
Colloidal precipitates are made up of colloidal particles which are really small (1 to 100 micrometres). Since they are small, they have a lot of surface area which promotes surface adsorption....