Indicator used in the estimation of hard watera.none of themb.EBTc.EDTAd.Ammonia buffer
Question
Indicator used in the estimation of hard water
a. none of them
b. EBT
c. EDTA
d. Ammonia buffer
Solution
The indicator used in the estimation of hard water is EDTA (Ethylenediaminetetraacetic acid). So, the correct answer is c. EDTA.
Here's a step-by-step explanation:
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Hard water contains high mineral content, especially calcium and magnesium ions.
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To estimate the hardness of water, a complexometric titration is used, where EDTA is the most common titrant.
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EDTA reacts with the calcium and magnesium ions in the water to form stable, water-soluble complexes.
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The end point of this titration is usually detected using a dye such as Eriochrome Black T, which changes color when all the metal ions have reacted with the EDTA.
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Therefore, EDTA is the indicator used in the estimation of hard water.
Similar Questions
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Describe the method which is used to provide residual hardness of water lessthan 2ppm. Draw diagram and write equations for the same.
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