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The Ins and Outs of Iodometric Titration

Created By: Hyprowira | Published Date: 19 May 2021 | Last Modified: 19 May 2021

Titration is generally divided into several types of methods, one of which is this iodometric titration. This type of titration is actually a derivative of a redox titration. Redox titration is a titration method that processes using redox reactions as the name suggests which is further divided into three types, one of which is iodometric titration which will be discussed in this article.

Apart from iodometry, there are two other types of redox titrations, namely the I2 method or indirect titration and the third is permanganometric titration. Now, let's take a closer look at the ins and outs of iodometric titration.

The ins and outs of iodometry begin with its understanding. Then, proceed with the function of this one titration method. Next you will also be told about the basic principles and workings of iodometry. The following is the full review

What is Iodometric Titration

Iodometric titration as mentioned above is a titration method which also occurs in a redox reaction. More precisely when basic iodine appears or disappears when the titration process is complete or reaches the end point. This method uses volumetric chemical analysis. The iodine will later be released in the presence of a reaction with the analyte / titrate.

This titration process will use sodium thiosulfate (Na2S2O3). This sodium thiosulfate is also known as a reducing agent to titrate the iodine. From this process, you can find out the concentration of the oxidizing agent in the solution being tested. This sodium thiosulfate is used as an indicator due to its high I2 absorption ability.

Iodometric Titration Functions

For those of you who are unfamiliar with this redox titration method, you must be wondering. Ask what is the function of the iodometric titration itself. Iodometry you will generally find most widely used in the pharmaceutical field. In the pharmaceutical field, this titration process is used to determine the content and quality of a substance before it is processed into drugs.

This titration is not usually performed as a single method. Iodometry will usually be paired with or followed by other measurement methods. One of the most commonly used is potentiometric titration. The aim is for the validation process and maintaining the accuracy of the measurement of the substance itself in order to prevent obvious errors that should not occur, especially in the pharmaceutical field.

Also read: Definition, How it Works, and Types of Acid-Base Titration

Principles of Iodometry

In summary, the redox titration works based on the transfer of electrons from the analyte to the titrant. If a compound is easily reduced, aka it can be used as a strong oxidizing agent, usually the positive value is high to reduce. This compound can also remove electrons from substances with a lower reduction potential.

This difference will affect the process of electron transfer earlier. So, this iodometric titration will see when a substance with a high reducing property oxidizes a substance with a lower reducing property. The difference will show the level of the substance itself in the titration process using this method

How Iodometry Works

To apply this iodometric titration method, you need to use or look for materials that have oxidizing properties. This oxidizing property means that it can or is able to remove electrons that are owned by other compounds. In other words, being able to do reduction in accordance with the basic principles described in the previous point.

This oxidizing material will later be dissolved in a solvent. The next thing that is done is that the solution will be acidified. You can choose which solution to acidify using hydrochloric acid, acetic acid, or sulfuric acid. After that, also add chlorine. You need to let the mixture sit for a few minutes in a dark place.

The process that occurs then is that the iodide will be released and then titrated with sodium thiosulfate. This sodium thiosulfate will become a reducing agent as the solution turns yellow and becomes more dilute. Next will also be added starch and then further titrated until the color of the solution becomes clear.

The way this titration method works also needs other support that must be considered, namely the completeness of the materials that have been mentioned earlier, as well as the titration tool that will be used later. If you are not very skilled at doing titration, don't hesitate to seek out or be accompanied by an expert. So about the ins and outs of iodometric titration that you can find out in this article.

Also read: How to Use Karl Fischer Titration You Need to Understand

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