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Chemistry Titration Techniques Overview

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Questions and Answers

What is the purpose of adding small concentrated doses in a water sample analysis?

To minimize displacement of the water sample (correct)

To enhance coloration of the sample

To ensure complete reaction of all chemicals

To increase the dissolved oxygen levels

Why is the container used in the titration processes fully submerged in water?

To maintain a consistent temperature

To ensure no extra dissolved oxygen is added from the atmosphere (correct)

To prevent contamination from external sources

To facilitate easier measurement of liquid volume

What indicator is used in the EDTA titration?

Eriochrome Black T (correct)

Bromothymol Blue

Methyl Orange

Phenolphthalein

In the EDTA titration, what color change occurs as a result of the reaction?

<p>Wine red to Blue</p> Signup and view all the answers

Which of the following is NOT one of the solutions added in the Winkler titration?

<p>Sodium Chloride</p> Signup and view all the answers

Study Notes

Addition of Small Concentrated Doses

Small concentrated doses are added to minimize the displacement of the water sample, ensuring accurate results.

Importance of Complete Submersion

Containers used for samples are completely submerged to prevent the introduction of additional dissolved oxygen from the atmosphere.

EDTA Titration Details

Indicator Used: Eriochrome Black T is the specific indicator for EDTA titration.
Colour Change: The titration undergoes a colour shift from wine red to blue, indicating the end point.
Condition Dependency: The colour change is dependent on pH, which is maintained using a pH buffer at a level of 9.

Winkler Titration Solutions

Three solutions are added to the sample in the Winkler titration:
- Alkaline Potassium Iodide (KI)
- Concentrated Sulphuric Acid
- Manganese(II) Hydroxide (Mn(OH)₂)

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Description

This quiz covers important titration techniques in chemistry, focusing on EDTA and Winkler titrations. Learn about the indicators used, the conditions necessary for accurate results, and specific solutions involved. Test your knowledge on the procedures and their significance in water sample analysis.