IODOMETRY AND IODIMETRY PDF

Iodometry, also known as iodometric titration, is a method of volumetric chemical analysis, involves indirect titration of iodine liberated by reaction with the analyte, whereas iodimetry involves direct titration using iodine as the titrant. What is the Difference Between Iodometry and Iodimetry? In Iodometry two redox reactions occur. In Iodimetry, only one redox reaction process. Iodometry and Iodimetry – Download as Word Doc .doc /.docx), PDF File .pdf), Text File .txt) or read online.

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Application of iodometry One interesting application of iodometry in the food industry is for determining sulphur dioxide SO 2 in wine.

From Wikipedia, the free encyclopedia.

Iodometry – Wikipedia

Sulfites and hydrogensulfites reduce iodine readily in acidic medium to iodide. You also know that an analyte is the substance being analyzed. Therefore, by determining the end point of the reaction, equations can be derived to obtain information of the stoichiometry and other necessary relationships between the reducing agent and Iodine which acts as the oxidizing agent iodometgy this case.

Together with reduction potential of thiosulfate: Important considerations Iodometric titration needs to be done in a weak acid environment which is why we need to remember that: Performing the titration Scales, source: Wikipedia articles needing clarification from June Iodine dissolves in the iodide-containing solution to give triiodide ions, which have a dark brown color.

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This is one difference between iodometry and iodimetry.

Difference Between Iodometry and Iodimetry l Iodometry vs Iodimetry

Auth with social network: The analysis that we will perform in the laboratory is the iodometric titration of cooper, which is a classical quantitative chemical analysis, a redox titration involving iodine. Available chlorine refers to chlorine liberated by the action of dilute acids on hypochlorite. Under strongly acidic solution, the above equilibrium lies far to the right hand side, but is reversed in almost neutral solution.

The basis of titration is a reaction between the analyte and a standard reagent known as the titrant. With red wines it is difficult to see the equivalence point because their intense red colour makes it difficult to perceive the colour change in the indicator. Awarded from the Generalitat de Catalunya, Slide 1: Iodine forms a deep-blue colour complex with starch and as the Iodine breaks down to Iodide ions, the colour disappears.

Overview and Key Difference 2.

Note that for the best results, the sulfide solution must be dilute with the sulfide concentration not greater iodometrg 0. Colour of the starch solution in the presence of I2.

Formula for the determination of sulphur dioxide. Forms of SO 2 in wine Once sulphur dioxide is added to wine it does not remain free but oxidates in part and in part combines with other molecues: Now, we are going to look at the redox titrations involving iodine.

In this method, excess but known amount of iodide is added to known volume of sample, in which only the active electrophilic can oxidize iodide to iodine.

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Steroglass ; ring line, source: What is Iodometry 3. Introduction to iodonetry and iodimetric titrations Examples Acid-base Quantification of acetic acid in vinegar Complexometric Precipitation Redox Slide 4: 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.

As you know, a direct titration involves one reaction between the analyte and the titrant.

INTRODUCTION TO IODOMETRIC AND IODIMETRIC TITRATIONS

Starch granules stained with iodine — through microscope. Once the bond between the iodine I 2 and the helical chain of beta-amylose is formed it turns an intense blue.

In Iodimetryonly one redox reaction process takes place. Fisher Scientific; beaker, source: Hydroperoxides in the presence of KI reduce as shown in the redox reaction below. The disappearance of the deep blue color is due to the decomposition of the iodine-starch clathrate marks the end point.

By using this site, you agree to the Terms of Use and Privacy Policy. The addition of an excess of I 2 makes the solution turn dark blue indicating that all the sulphur dioxide in the sample has been titrated.