Explain the terms hard water and soft water write note on the
a)Ion exchange method
b) calgon method for the removal of hardness of water
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a) Ion exchange is a water treatment method where one or more undesirable ionic contaminants are removed from water by exchange with another non-objectionable, or less objectionable ionic substance.
B) Adding Calgon to rough water results in sodium ions being separated from Calgon's anion by hard water calcium and magnesium ions. The effect is the extraction from hard water, in the form of a Calgon complex, of calcium and magnesium ions. It softens the water and releases sodium ions.
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