Abstract

Silver Bullet for the Computation of Equivalent Weight of Sodium Thiosulphate in the Reaction 2S₂O^2-₃+I_2 →S₄O^2-₆+2I^-A Chemical Education Article for Freshmen Student

Sanjeev R¹, V. Jagannadham², Veda Vrath R³and V. E. M. Mamatha Bethapudi¹

DOI : http://dx.doi.org/10.13005/ojc/330566

Abstract:

When we standardize sodium thiosulphate solution either by iodometry or by a iodimetry, we base our understanding on While addressing the freshmen students, especially during the pre-experimental lectures, we teach them the computation of equivalent weight of sodium thiosulfate (hypo); this necessitates the knowledge of the difference in oxidation state of sulphur atoms in the product (2.5) and the reactant side (2.0); the difference in oxidation state of sulphur atoms is 0.5. The overtly observable query which occurs to the students is, “Is the equivalent weight and molecular weight of sodium thiosulphate same or different?” If yes, then the change in the oxidation state apparently does not conform to the difference, 0.5. This article deals with this apparently simple but extremely perplexing question.