Question:
Hardness of water is estimated by titration with
Hardness of water is estimated by titration with
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EDTA is a powerful reagent for titrations and is commonly used for determining water hardness by forming stable complexes with calcium and magnesium ions.
Updated On: Apr 30, 2025
- DMG
- Cupron
- \(\alpha\)-nitroso-\(\beta\)-naphthol
- Na\(_2\)] EDTA
- Ethylenediamine
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The Correct Option is D
Solution and Explanation
The hardness of water refers to the concentration of calcium (Ca²âº) and magnesium (Mg²âº) ions in the water. One of the most common methods for determining the hardness of water is by using EDTA (Ethylene Diamine Tetra Acetic Acid), which forms complexes with the metal ions, thus enabling titration.
- Option (A): DMG (Dimethylglyoxime) is used for determining nickel, not for water hardness.
- Option (B): Cupron is a reagent used for copper analysis, not hardness estimation.
- Option (C): \(\alpha\)-nitroso-\(\beta\)-naphthol is used for copper determination, not for hardness testing. - Option (D): Naâ‚‚EDTA (sodium ethylenediaminetetraacetate) is a well-known reagent used in complexometric titrations to determine the hardness of water by forming complexes with calcium and magnesium ions. - Option (E): Ethylenediamine is used in coordination chemistry but is not typically used for estimating water hardness. Thus, the correct answer is (D) Naâ‚‚EDTA, as it is used for the titration to estimate the hardness of water.
- Option (A): DMG (Dimethylglyoxime) is used for determining nickel, not for water hardness.
- Option (B): Cupron is a reagent used for copper analysis, not hardness estimation.
- Option (C): \(\alpha\)-nitroso-\(\beta\)-naphthol is used for copper determination, not for hardness testing. - Option (D): Naâ‚‚EDTA (sodium ethylenediaminetetraacetate) is a well-known reagent used in complexometric titrations to determine the hardness of water by forming complexes with calcium and magnesium ions. - Option (E): Ethylenediamine is used in coordination chemistry but is not typically used for estimating water hardness. Thus, the correct answer is (D) Naâ‚‚EDTA, as it is used for the titration to estimate the hardness of water.
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