What is the difference between multimolecular and macromolecular colloids?
Give one example of each type. How are associated colloids different from these
two types of colloids?
Multimolecular Macromolecular Associated
colloids colloids colloids
(i) They are formed by the They are molecules of large They are formed by aggre-
aggregation of a large size e.g. polymers like rubber, gation of a large number of
number of atoms or molecu nylon, starch, proteins etc. ions in concentrated solution
les which generally have e.g. soap sol.
diameter less than 1 mm,
e.g. sols of gold, sulphur
(ii) Their molecular masses They have high molecular Their molecular masses are
are not very high. masses. generally high.
(iii) Their atoms or molecu- Due to long chain, the Van Higher is the concentration,
les are held together by weak der Waals forces holding them greater are the Van der walls
Van der Waals forces. are comparatively stronger. forces.