Complexometric Titration
EDTA is used in complexometric titration to determine:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- complexometric titration
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Hardness of water (Ca²⁺, Mg²⁺)
EDTA (Ethylenediaminetetraacetic acid) is a hexadentate chelating agent.
- Application: Specifically used to measure the Total Hardness of water, which is caused by the presence of Ca2+ and Mg2+ ions.
- Indicator: Eriochrome Black T (EBT) is used. In the presence of metal ions, EBT forms a wine-red complex. As EDTA is added, it 'steals' the metal ions from the EBT. Once all metal ions are complexed by EDTA, the indicator returns to its free blue color, signaling the end point.
This easy difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of complexometric titration. It appeared in the 2025 exam.
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