Solving a complex task. Application of the electron-ion balance method to formulate redox reaction equations
Abstract. This article reviews examples of using the electron-ion balance method to assign coefficients in redox reactions involving organic and inorganic compounds. The author proposes using this method to solve tasks involving redox reactions in which the reaction products are difficult to identify. Particular attention is paid to the fact that using electron-ion balance allows to set up successfully complete equations for redox reactions, especially with organic compounds. The article provides examples of half-reactions involving the most commonly used oxidizing agents in organic chemistry — potassium permanganate and potassium dichromate — in various environments. An algorithm for formulating half-reactions involving organic and inorganic compounds is also discussed. Using the electron-ion balance method allows to solve difficult exam tasks, reduce the time spent on this type of task, and determine the reaction products.
The half-reaction method is rarely used in school Chemistry classes, but its simplicity and accessibility can be useful for solving complex tasks, especially under time limits when solving Chemistry Unified State Exam assignments, as well as when solving Olympiad tasks. Using a variety of problem-solving methods broadens students’ horizons and makes them aware of a wide range of chemical knowledge that extends beyond the pages of a school textbook.