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REDOX TITRATIONS WITH IODINE

REDOX TITRATIONS WITH IODINE 2025

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The document outlines a laboratory procedure for conducting redox titrations using iodine to analyze the concentration of hydrogen peroxide in disinfectants and ascorbic acid in vitamin C tablets. It explains the principles of iodimetric and iodometric titrations, detailing the reactions involved, the preparation of iodine solutions, and the necessary materials and steps for standardization and analysis. The document emphasizes the importance of accurately determining active ingredient concentrations in pharmaceutical products.

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What are the main source of error in titration involving iodine?

Two possible sources of error can influence the outcome of the iodometric titration. One is the air oxidation of acid-iodide solution and the other is the volatility of I2. The first one can be eliminated by adding an excess of sodium carbonate in the reaction vessel.

Why are iodometric titrations done in an acidic environment?

The pH of the solution is generally kept neutral or mild alkaline or mild acidic during iodometric titrations because these conditions significantly play a role in the oxidation of iodide to iodine in iodometric titrations. Oxidation of iodine occurs by atmospheric oxygen if the solution is acidic.

Why are titrations with iodine never carried out under basic conditions?

In Alkaline solution This leads to an error in the endpoint of the titration of the starch-iodine complex with sodium thiosulphate solution thereby causing an error in the calculation of the amount of analyte (oxidizing agent) present. Hence, higher alkaline pH is not preferred for Iodometric titration.

What is a redox titration of iodine?

A common example of a redox titration is the treatment of a solution of iodine with a reducing agent to produce iodide using a starch indicator to help detect the endpoint. Iodine (I2) can be reduced to iodide (I) by, say, thiosulfate (S 2O23), and when all the iodine is consumed, the blue colour disappears.

What are the disadvantages of iodometric titration?

Ans. One common pitfall associated with Iodometry titration is using an iodine solution that has a concentration that is too high. This can cause the iodine to react too quickly and can result in an inaccurate measurement.

Why must iodine be titrated immediately?

In acid solution, prompt titration of the liberated iodine is necessary in order to prevent oxidation. Starch solutions that are no longer fresh or improperly prepared. The indicator will then not behave properly at the endpoint and a quantitative determination is not possible.

How to do iodine titration?

Add to Erlenmeyer flask 50 mL of demineralized water, 10 mL of sulfuric acid solution, 10-15 mLs of potassium iodide solution, and two drops ammonium molybdate solution. Titrate with 0.1 N sodium thiosulfate to faint yellow or straw color. Swirl or stir gently during titration to minimize iodine loss.

Why is iodine used in titration?

Iodine-Sodium Thiosulfate Titrations are commonly used in analytical chemistry to determine the amount of iodine in a sample. The method is widely used in various industries, such as water treatment, agriculture, and food science, to monitor the levels of iodine in water, soil, and food samples.

REDOX TITRATIONS WITH IODINE 2025

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