Podcast
Questions and Answers
What is the purpose of adding small concentrated doses in a water sample analysis?
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?
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?
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?
In the EDTA titration, what color change occurs as a result of the reaction?
Which of the following is NOT one of the solutions added in the Winkler titration?
Which of the following is NOT one of the solutions added in the Winkler titration?
Flashcards
Small doses in water analysis
Small doses in water analysis
Minimizing water sample displacement during analysis.
Titration container submersion
Titration container submersion
Ensuring no additional dissolved oxygen enters the sample from the air.
EDTA indicator
EDTA indicator
Eriochrome Black T is the indicator used in EDTA titrations.
EDTA color change
EDTA color change
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Winkler titration, excluded solution
Winkler titration, excluded solution
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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)â‚‚)
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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.
