. What is the difference between multimolecular and macromolecular colloids? Give one example of each type


What is the difference between multimolecular and macromolecular colloids? Give one example of each type. How are associated colloids different from the above two types of colloids

Best Answer

(i) Macro molecular colloids: Macromolecules in suitable solvents form solution. Where in size of the macromolecules may fall within the colloidal range. The system showing such characteristics are called macromolecular colloids. The colloids are quite stable and in many respect they resemble true solutions. Examples of naturally occurring macro molecules are starch, cellulose, proteins and those of manmade macromolecules are nylon, polythene, polystyrene, synthetic rubber etc

(ii) Multimolecular colloids: A large number of atoms or smaller molecules (diameter < 1 nm) of a substance on dissolution aggregate together to form species having size in the colloidal range. Such species are called multimolecular colloids. Example: A sulphur sol contains thousands of S8 sulphur molecules, a platinum or gold sol may have particles of various sizes having many atoms

(iii) Associated colloides (Micelles): There are certain substances which at low concentrations behave like normal strong electrolytes but at higher concentration behave as colloidal solutions due to the formation of aggregated particles. Such colloids are associated colloids and aggregated particles as micelles. Examples: soaps and detergents

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