Question

explain calgon's method in detail......

Answer 1

Calgon is a trade name of a complex salt, sodium hexametaphosphate

(NaPO3)6. It is used for softening hard water. Calgon ionizes to give a complex anion:



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.



This results in the removal of calcium and magnesium ions from hard water in the form of a complex with Calgon. The water is softened and sodium ions are released into water.

Answer 2

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Here is your answer

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$\red{Soft\:water}$:

The water which gives lather readily with soap solution is called Soft water

$\red{Hard\:water}$:

The water which doesn't give lather readily with soap solution is called as Hard water

Bicarbontes, calcium, chlorides, Sulphates of magnesium causes the hardness of water

Calgon method :

Sodium meta hexa phosphate

Formula :

$\bold{Na_2[Na_4[PO_3]_6]}$

Hardness of water can be removed by passing calgon into the hard water