Abstract
Volumetric methods using oxidation and reduction reactions depend on the potential of half-reactions involved but, beyond favorable potential conditions, the oxidizing and reducing agents must be stable in solution and the substance to be determined should have a stable oxidation state, defined before the titration is started. Iodometry is an indirect volumetric method, where an excess of iodide ions are added to a solution containing the oxidizing agent, which react producing an equivalent quantity of iodine that is then titrated with a standardized solution of sodium thiosulfate.
Keywords
half-reactions, oxidation state, volumetry, redox reactions, oxidizing agents, reducing agents, iodometry
Author
João Carlos de Andrade
Universidade Estadual de Campinas, Instituto de Química
Translated by
João C. de Andrade
Revised by
Carol H. Collins
Warning
Attention: “Read carefully the procedure before starting the experiment. Do not perform the experiment without being monitored by your teacher. In doubt ask for help!”
