The major difference between iodometric and iodimetric titration is that iodometry is an indirect titration process, in which the iodine used before the redox titration is produced through a separate titration, whereas iodimetry is a direct titration process, in which the analyte of interest is supposed to be a reducing agent.
Titrations are based on the reaction between the titrant of known concentration and the sample analyte of unknown concentration, in which an indicator is used to identify the endpoint. Titration has four major types, acid-base, redox, precipitation, and complexometric titration.
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In analytical chemistry, iodometry and iodimetry are common volumetric analysis titration methods. These two types of titrations depend on oxidation-reduction and can be used to determine redox species quantitatively. Iodine can be used for this redox titration, because of its ability to react quickly with a wide range of species.
What is iodometric titration?
The method is called iodometry when a solute (oxidizing agent) is added to excess iodide to obtain iodine, and the amount of iodine produced is estimated by titration with a sodium thiosulfate solution.
It is an indirect titration process, in which the iodine used before the redox titration is produced through a separate titration. The iodometric titration experiment is performed to find out the concentration of solute is used to produce iodine. When the amount of oxidizing agents in a water body desires to be determined, this testing is more popular.
What is iodimetric titration?
Iodimetry is a method for titrating a compound (reducing agent) directly with a standard iodine solution. It is a direct titration process, in which the analyte of interest is supposed to be a reducing agent. Information on the stoichiometry equations and other required interactions, such as reducing agents and iodine solution, which acts as an oxidising agent, can be used to determine the reaction's endpoint.
Difference between iodometric and iodimetric titration:
- Iodometric titration is an indirect titration method, whereas iodimetric titration is a direct titration method.
- The Iodometric method is used to determine oxidizing agents, whereas the iodimetric method is used to determine reducing agents.
- In iodometric titrations, iodine that has been formed as a result of a prior redox reaction is titrated with a reducing agent (thiosulfate ions), whereas in iodimetric titrations, an iodine solution is directly titrated with a reducing solution.
- In iodometric titration, the total number of redox reactions is two, whereas, in iodimetry titration, the total number of redox reactions is one.
- Iodometry is commonly applied in several experiments, whereas iodimetry is less commonly applied in experiments.
Commonly asked questions on titration are as follows.
Which indicator is used in iodometric and Iodimetric titration?
Generally, the starch indicator is used in iodometric and Iodimetric titration, Iodine with starch produces a dark blue complex. In iodimetry, the endpoint corresponds to a drastic color change from red to blue.
Why iodometric titration is called indirect titration?
In an acidic solution, almost all oxidising agents will quantitatively oxidise the iodide ion to iodine. A normal sodium thiosulfate solution can be used to titrate the iodine generated in the reaction. Iodometry is the name given to this sort of indirect titration.
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