IODOMETRY AND IODIMETRY PDF

Basic principles[ edit ] Dilute solutions containing iodine-starch complex. The color above can be seen just before the endpoint is reached. To a known volume of sample, an excess but known amount of iodide is added, which the oxidizing agent then oxidizes to iodine. Iodine dissolves in the iodide-containing solution to give triiodide ions, which have a dark brown color.

Author:Mabei Julkis
Country:Dominican Republic
Language:English (Spanish)
Genre:Relationship
Published (Last):14 June 2018
Pages:246
PDF File Size:6.42 Mb
ePub File Size:1.23 Mb
ISBN:740-6-81036-372-1
Downloads:45205
Price:Free* [*Free Regsitration Required]
Uploader:Brazshura



Summary What is Iodometry? In iodometry, iodides react with another oxidizing agent in an acidic medium or neutral medium. When this reaction takes place, iodide we add iodide in the form of KI oxidizes to iodine and the other species will undergo reduction by iodide. Then we can titrate the released iodine with another species. This titrating species is a standard solution of a reducing agent, which is capable of reducing iodine back to iodide form.

Usually, we use a standard thiosulphate solution for this. For example, if we want to quantify the amount of chlorine dissolved in a mixture, the following is the method to carry out an iodometric titration. First, we should take a known amount of volume from the mixture in which chlorine is dissolved into a titration flask. Then we can titrate it with a known solution of KI, and we can find the volume consumed. For this, we can titrate the mixture with a standard thiosulphate solution.

We need to add starch as an indicator, to determine the end point of this reaction. With iodine and starch in the mixture, it will appear in dark-blue colour, but at the end point when all the iodine is finished, the dark colour will disappear. What is Iodimetry? In iodimetry, it uses free iodine to undergo titration with a reducing agent.

Therefore, iodine reduces to iodide, and iodine will oxidize other species. Figure Performing a Titration Since we cannot easily prepare a free iodine solution, we have to mix iodine with potassium iodide and KI3 solution to prepare the required solution.

And a standard solution of this is used for the iodometric titrations. We can use starch as an indicator for iodometric titrations too. Iodometry is the quantitative analysis of a solution of an oxidizing agent by adding an iodide that reacts to form iodine, which is then titrated whereas iodimetry is a volumetric analysis involving either titration with a standardized solution of iodine, or the release by a substance under examination of iodine in soluble form, so that we can determine its concentration by titration.

This is one difference between iodometry and iodimetry. Furthermore, another difference between iodometry and iodimetry is that, in iodometry, iodides react with another oxidizing agent in an acidic medium or neutral medium while in iodimetry, it uses free iodine to undergo titration with a reducing agent.

The below infographic presents the difference between iodometry and iodimetry in tabular form. The key difference between iodometry and iodimetry is that we can use Iodometry to quantify oxidizing agents, whereas we can use iodimetry to quantify reducing agents. Reference: 1. Available here 2. Naviglio, Daniele. Available here Image Courtesy: 2.

ANDERTON CIRCLIP PDF

Difference Between Iodometry and Iodimetry

Summary What is Iodometry? In iodometry, iodides react with another oxidizing agent in an acidic medium or neutral medium. When this reaction takes place, iodide we add iodide in the form of KI oxidizes to iodine and the other species will undergo reduction by iodide. Then we can titrate the released iodine with another species. This titrating species is a standard solution of a reducing agent, which is capable of reducing iodine back to iodide form. Usually, we use a standard thiosulphate solution for this. For example, if we want to quantify the amount of chlorine dissolved in a mixture, the following is the method to carry out an iodometric titration.

C945 TRANSISTOR DATASHEET PDF

Difference between Iodometry and Iodimetry

Iodometry is used to determine the concentration of oxidising agents through an indirect process involving iodine as the intermediary. In the presence of iodine, the thiosulphate ions oxidise quantitatively to the tetrathionate ions. To determine the concentration of the oxidising agents, an unknown excess of potassium iodide solution is added to the weakly acid solution. The iodine, which is stoichiometrically released after reduction of the analyte, is then titrated with a standard sodium thiosulphate solution Na2S2O3.

ALAN REDPATH VICTORIOUS CHRISTIAN LIVING PDF

Lifestyle Difference between Iodometry and Iodimetry Iodometry and iodimetry tend to related to each other due to the presence of iodine. These terms are commonly used in titration by the use of iodine to test the concentration of an analyte under investigation. The core difference between iodometry and iodimetry is iodometry is an indirect titration method while iodimetry is a direct titration method. What Is Iodometry? Iodometry is an indirect titration method where the iodine used was produced prior to redox titration is quantified through a separate titration. The iodometric titration experiment help to determine the concentration of analyte that is used to produce iodine.

Related Articles