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”. involve the potentiometric titration of aqueous iodine with sodium thiosulfate the analyte (a reducing agent) reacts with iodine to produce iodide: iodimetry. Titrations Fajans Preciptation Complexometric. Fact File 1: Introduction to iodometric and iodimetric titrations. Quantitative Classical Chemical Analysis. Titrations.

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A direct titration with only 1 reaction: The iodine, which is stoichiometrically released after reduction of the analyte, is then titrated with nad standard sodium thiosulphate solution Na 2 S 2 O 3.

Difference Between Iodometry and Iodimetry l Iodometry vs Iodimetry

To determine the concentration of the oxidising agents, an unknown excess of titratiobs iodide solution is added to the weakly acid solution. What is the other classical quantitative analysis? Then we can titrate the released iodine with another species. The anlyte is a reducing agent.

For analysis of antimony V compounds, some tartaric acid is added to solubilize the antimony III product.

Licensed under Public Domain via Commons. Remember, we classify titrations according to the type of reaction between the titrant and the analyte. Now, in order to be able to quantify the analyte, we need the analyte to react with a substance of a known concentration. By using this site, you agree to the Terms of Use and Privacy Policy. This absorption will cause the solution to change its colour from light yellow to a dark blue colour when titrated with standardised thiosulfate solution.


Difference Between Iodometry and Iodimetry

Iodine I2 Iodometric titrations: Iodometry in its many variations is extremely anx in volumetric analysis. Introduction to iodometric and iodimetric titrations Example: What is Iodometry 3. In a strong acid environment thiosulphate decomposes to S 2 ; 4.

Pre-treatment of the sample. Le lezioni del Corso 1.

The iodometric titration is a general method to determine the concentration of an oxidising agent in solution. Thi is iodomftric of the advantages of using sulphur dioxide because it guarantees the stability of the product over time. One interesting application of iodometry in the food industry is for determining sulphur dioxide SO 2 in wine. In Iodimetric titrations, an Iodine solution is directly titrated with a reducing solution. In our case, the analyte is the substance that is being quantified.

Due to the oxidizing agents present in the water body, the Iodide ions get oxidized to Iodine, while the oxidizing agents get reduced. Examples include the determination of copper IIchlorateHydrogen peroxideand dissolved oxygen:. Yes, we have done other redox titrations like the determination of the percent of hydrogen peroxide and other ones.


Iodometry and Iodimetry, Daniele Naviglio « Analytical Chemistry « Agraria « Federica e-Learning

Fisher Scientific; beaker, source: This is one difference between iodometry and iodimetry. Although the sulfide content in sample can be determined straight forwardly as described for sulfites, the results are often poor and inaccurate. As we saw in slide 2, we classify redox titrations according to the titrant which is being used. You also know that an analyte is the substance being analyzed. As the names Iodometry and Iodimetry suggest, they relate to a process where Iodine is involved.

The titration reaction can be represented as:.

We can use starch as an indicator for iodometric titrations too. This titrating species is a standard solution of a reducing agent, which is capable of reducing iodine back to iodide form.

Iodometry is an indirect titration method whereas iodimetry is a direct titration method. What happens here is, an excess amount of Iodide solution typically Potassium Iodide is mixed with a sample of the water that needs to be tested.