Iodometry is an indirect titration method whereas iodimetry is a direct titration method. This is the main difference between Iodometry and. Iodometry and iodimetry are two common titration methods useful in analytical chemistry. Iodometry is the quantitative analysis of a solution of. IODIMETRIC TITRATIONS When an analyte that is a reducing agent (like hypo) is titrated directly with a standard iodine solution, the method is called “iodimetry”.

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Titration involving iodine commonly uses a starch suspension as indicator. We have left redox titrations until now, because you needed to be familiar with the other three type of titrations. A better, alternative method with higher accuracy is available, which involves the addition of excess nad known volume of standard sodium arsenite solution to the sample, during which arsenic trisulfide is precipitated:.

Difference Between Iodometry and Iodimetry

Iodometry is commonly employed to determine the active amount of hypochlorite in bleach responsible for the bleaching action. This is one difference between iodometry and iodimetry. Introduction to iodometric and iodimetric titrations Examples Acid-base Quantification of acetic acid in vinegar Complexometric Precipitation Redox Slide 4: This absorption will cause the solution to change its colour from light yellow to a dark blue colour when titrated with standardised thiosulfate solution.

Carrying out the titration 2. Thi is another of the advantages of using sulphur dioxide because it guarantees the stability of the product over time. Standard iodine solutions are of fairly limited use compared to oxidants because of their small electrode potential.


Introduction to iodometric and iodimetric titrations. Iodometryalso known as iodometric titrationis a method of volumetric chemical analysisa lodometric titration where the appearance or disappearance of elementary iodine indicates the end point.


Principles of method Hydroperoxides in the presence of KI reduce as shown in the redox reaction below. In a strong acid environment thiosulphate decomposes to S 2 ; 4. We need to add starch as an indicator, to determine idoimetric end point of this reaction. However, it is more common to use Iodometric methods for analysis rather than Iodimetric methods.

In iodometry, iodides react with another oxidizing agent in an acidic medium or neutral medium. To summarise the main information about iodimetric and iodometric titrations: The technique of Iodometry is commonly used in experiments where the amount of oxidizing agents in a water body needs to be quantified. Some typical kinds of chemical reactions: The substance of a known concentration is called the titrant. With red wines it is difficult to see the equivalence point because their iodimettric red colour makes it difficult to perceive the colour change in the indicator.

Iodometry is anc commonly seen in experiments.

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.

Yes, remember the four types are: Iodometry is commonly used to analyze the concentration of oxidizing agents in water samples, such as oxygen saturation in ecological studies or active chlorine in swimming pool water analysis.

Redox titration using sodium thiosulfateNa 2 S 2 O 3 usually as a reducing agent is known as iodometric titration since it is used specifically to titrate iodine.

Remember that we started working with acid-base titrations, then we moved on to complexometric titrations and finally we saw precipitation titrations. Starch granules stained with iodine — through microscope.


Moreover, we can use iodine for this redox titrations due to its capability of reacting fast with many species. And a standard solution of this is used for the iodometric titrations. Retrieved from ” https: Istituto Magistrale “Leonardo da Vinci” di Alba.

Oxidation is a chemical process which is catalysed by various factors presence of oxygen, levels of unsaturation in the oil, presence of metals, temperature and leads to the formation of hydroperoxides. Sodium thisoufate Slide 8: Since we cannot easily prepare a free iodine solution, we have to mix iodine with potassium iodide and KI 3 solution to prepare the required solution.

The tigration of these titratikn types of titrations is oxidation-reduction, and we can tittation it to determine iodmoetric species quantitatively. The term iodimetry, on the other hand, refers to titration using an iodine solution and is useful for determining substances that have reducing properties.

Then we should carry out another titration with the same mixture to determine the released amount of iodine. Therefore, in this case, only one redox reaction takes place unlike in the case of the Iodometric titration. For example, the reaction:.


Leave a Reply Cancel reply. Yes, we have done other redox titrations like the determination of the percent of hydrogen peroxide and other ones. As mentioned in the definition, this is a direct titration method.