Class 12 Exam > Class 12 Questions > In the estimation of hardness of water, the r...
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In the estimation of hardness of water, the reagent used is
- a)hypo solution
- b)KMnO4
- c)EDTA solution
- d)K2Cr2O7
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In the estimation of hardness of water, the reagent used isa)hypo solu...
The quantity of Ca, Mg salts in water is estimated by using standard EDTA solution using erichrome black T as an indicator.
Most Upvoted Answer
In the estimation of hardness of water, the reagent used isa)hypo solu...
The EDTA solution can then be used to determine the hardness of an unknown water sample. Since both EDTA and Ca2+ are colorless, it is necessary to use a special indicator to detect the end point of the titration.
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In the estimation of hardness of water, the reagent used isa)hypo solu...
Understanding Water Hardness
Water hardness primarily arises from the presence of dissolved minerals, mainly calcium and magnesium ions. Hard water can cause scaling in pipes and reduce the efficiency of soap and detergents.
Reagents Used in Hardness Estimation
When estimating water hardness, different reagents can be used, but the most effective is:
EDTA Solution
- What is EDTA?
EDTA (Ethylenediaminetetraacetic acid) is a chelating agent that binds to metal ions, including calcium and magnesium, forming stable complexes.
- Why Use EDTA?
- Selectivity: EDTA selectively binds to divalent metal ions, making it ideal for estimating hardness.
- Titration Method: The hardness of water can be determined through a titration process where EDTA is added until all calcium and magnesium ions are complexed. The endpoint is usually indicated by a color change using a suitable indicator like Eriochrome Black T.
- Accuracy: This method provides precise measurements of total hardness, allowing for effective water quality assessment.
Other Reagents Explained
- Hypo Solution:
Not suitable for hardness estimation; primarily used for chlorination in water treatment.
- KMnO4:
Used for redox titrations, but not specifically for measuring hardness.
- K2Cr2O7:
A reagent for determining chemical oxygen demand (COD) and other oxidation-reduction reactions, but not for hardness estimation.
Conclusion
In summary, EDTA solution is the reagent of choice for estimating water hardness due to its effectiveness in complexing calcium and magnesium ions, thus providing an accurate measurement of water quality.
Water hardness primarily arises from the presence of dissolved minerals, mainly calcium and magnesium ions. Hard water can cause scaling in pipes and reduce the efficiency of soap and detergents.
Reagents Used in Hardness Estimation
When estimating water hardness, different reagents can be used, but the most effective is:
EDTA Solution
- What is EDTA?
EDTA (Ethylenediaminetetraacetic acid) is a chelating agent that binds to metal ions, including calcium and magnesium, forming stable complexes.
- Why Use EDTA?
- Selectivity: EDTA selectively binds to divalent metal ions, making it ideal for estimating hardness.
- Titration Method: The hardness of water can be determined through a titration process where EDTA is added until all calcium and magnesium ions are complexed. The endpoint is usually indicated by a color change using a suitable indicator like Eriochrome Black T.
- Accuracy: This method provides precise measurements of total hardness, allowing for effective water quality assessment.
Other Reagents Explained
- Hypo Solution:
Not suitable for hardness estimation; primarily used for chlorination in water treatment.
- KMnO4:
Used for redox titrations, but not specifically for measuring hardness.
- K2Cr2O7:
A reagent for determining chemical oxygen demand (COD) and other oxidation-reduction reactions, but not for hardness estimation.
Conclusion
In summary, EDTA solution is the reagent of choice for estimating water hardness due to its effectiveness in complexing calcium and magnesium ions, thus providing an accurate measurement of water quality.
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In the estimation of hardness of water, the reagent used isa)hypo solutionb)KMnO4c)EDTA solutiond)K2Cr2O7Correct answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about In the estimation of hardness of water, the reagent used isa)hypo solutionb)KMnO4c)EDTA solutiond)K2Cr2O7Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the estimation of hardness of water, the reagent used isa)hypo solutionb)KMnO4c)EDTA solutiond)K2Cr2O7Correct answer is option 'C'. Can you explain this answer?.
In the estimation of hardness of water, the reagent used isa)hypo solutionb)KMnO4c)EDTA solutiond)K2Cr2O7Correct answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about In the estimation of hardness of water, the reagent used isa)hypo solutionb)KMnO4c)EDTA solutiond)K2Cr2O7Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the estimation of hardness of water, the reagent used isa)hypo solutionb)KMnO4c)EDTA solutiond)K2Cr2O7Correct answer is option 'C'. Can you explain this answer?.
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