1. Write the reaction between EDTA and magnesium ion in hard water
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Explanation:
You may have been told this occurs because you have "hard" water. ... A few drops of an indicator are added to a water sample. Then, a compound called EDTA (short for ethylenediaminetetraacetic acid) is slowly added to the sample. EDTA forms complexes with the calcium and magnesium ions that are red.
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