Chapter 35: Problem 18

What are the differences between iodometric and iodimetric titrations? Name the indicator used in these titrations.

Short Answer

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The main difference between iodimetric and iodometric titrations is the generation of iodine. In iodimetric titrations, iodine is directly used for the titration, whereas in iodometric titration, iodine is generated during the reaction. The indicator commonly used in these titrations is a starch solution, which forms a blue-black complex with iodine when added towards the end of the titration.

Step by step solution

Understanding Iodimetric Titration

Iodimetric titration refers to the direct titration of an iodine-consuming substance with a standard solution of iodine. This is often used for determining oxidizing agents.

Understanding Iodometric Titration

Iodometric titration, on the other hand, involves generating iodine in the reaction mixture via an intermediate process and then titrating with standard solution of sodium thiosulphate (also known as hypo solution). Iodometric titrations are more common for reducing agents determination.

Illustrating the Difference between Iodometric and Iodimetric Titration

The primary difference between iodometric and iodimetric titration lies in the generation of iodine. In iodometric titrations, the iodine is produced during the reaction, whereas in iodimetric titrations, iodine is directly used.

Understanding the Indicator Used

The indicator used in these titrations is starch solution. It is added towards the end of these titrations, once the solution becomes pale yellow. The starch forms a blue-black complex with iodine, indicating the presence of iodine in solution.

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What are the differences between iodometric and iodimetric titrations? Name the indicator used in these titrations.

Short Answer

Step by step solution

Understanding Iodimetric Titration

Understanding Iodometric Titration

Illustrating the Difference between Iodometric and Iodimetric Titration

Understanding the Indicator Used

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