what is the cause for permanent hardness of water ? explain the removal of hardness of water by calgon method.
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The addition of Calgon to hard water causes the calcium and magnesium ions of hard water to displace sodium ions from the anion of Calgon. From hard water Anion of calgon Goes into solution This results in the removal of calcium and magnesium ions from hard water in the form of a complex with Calgon.
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