What is the Difference Between Iodometry and Iodimetry?

The main difference between iodometry and iodimetry lies in the number of redox reactions involved and the purpose of each method. Here is a comparison of the two titration methods:

In iodometric titration, an analyte (an oxidizing agent) is added to excess iodide to yield iodine, and the iodine is then reduced by the reducing agent. This method involves two redox reactions. On the other hand, in iodimetric titration, the analyte (a reducing agent) is titrated directly with a standard iodine solution, and only one redox reaction occurs. Iodimetry is an indirect titration method, while iodometry is a direct titration method.

Comparative Table: Iodometry vs Iodimetry

The main differences between iodometry and iodimetry are the titration method, the type of reactions involved, and the purpose of the analysis. Here is a table summarizing the differences:

In iodometry, an oxidizing agent is added to excess iodide ions, which are then oxidized to form iodine. The iodine is then reduced by the analyte, and the reaction is used to determine the concentration of the oxidizing agent. In contrast, iodimetry involves titrating an analyte (a reducing agent) directly with a standard iodine solution, and the reaction is used to determine the concentration of the reducing agent. Both methods use a standardized solution of sodium thiosulfate for titration and rely on the use of iodine and its compounds as key reagents.