Explain edta is a good complexing agent for determination of hardness in water.
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The quality of a water supply is established as its degree of hardness. Hardness is defined as calcium and magnesium ion content. Since most hardness is caused by carbonate mineral deposits, hardness is usually reported as parts per million (ppm) of calcium carbonate (by weight).
Water hardness can be readily determined by titration with the chelating agent EDTA (ethylenediaminetetraacetic acid). This reagent is a weak acid that can lose four hydrogen atoms on complete neutralization. It has four acid oxygen sites and the two nitrogen atoms that have unshared electron pairs, which can form bonds to a metal ion forming a complex ion or a stable coordination compound.
As EDTA is added to the hard water solution, it will complex all the free Ca2+ and Mg2+ ions until essentially all of the calcium and magnesium have been converted to chelates.
Water hardness can be readily determined by titration with the chelating agent EDTA (ethylenediaminetetraacetic acid). This reagent is a weak acid that can lose four hydrogen atoms on complete neutralization. It has four acid oxygen sites and the two nitrogen atoms that have unshared electron pairs, which can form bonds to a metal ion forming a complex ion or a stable coordination compound.
As EDTA is added to the hard water solution, it will complex all the free Ca2+ and Mg2+ ions until essentially all of the calcium and magnesium have been converted to chelates.
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Answer:Water hardness can be readily determined by titration with the chelating agent EDTA (ethylenediaminetetraacetic acid).As EDTA is added to the hard water solution, it will complex all the free Ca2+ and Mg2+ ions until essentially all of the calcium and magnesium have been converted to chelates.
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