Question
Define the following terms:
(i) Brownian movement
(ii) Peptization
(iii) Multimolecular colloids
Solution
(i) The continuous random zigzag motion of colloidal particles in the colloidal solution, when observed under an ultramicroscope, is called Brownian movement/motion.
(ii) Peptization is defined as the process of conversion of a precipitate into a colloidal solution by shaking it with the dispersion medium in presence of small amount of an electrolyte.
(iii) Multimolecular colloids are species having a size in the colloidal range (diameter < 1 nm) that are formed by the aggregation of a large number of atoms or small molecules of substances when dissolved in the dispersion medium.
