Calgon removes hardness of water containing calcium ions by

Asked by admin @ 23/08/2021 in Chemistry viewed by 322 People

Calgon method for removal of hardness of water

Answered by admin @ 23/08/2021

REMOVAL OF HARDNESS

Explanation:

Complex salt, sodium hexametaphosphate (NaPO3)6 is a trade name for Calgon. It is being used for water softening. To give a complicated anion, Calgon ionizes:

$(NaPO_{3} )_{6}$ or $Na_{2} (Na_{4} P_{6} O_{18} )$ → $2Na^{+}$ + ${Na_{4} P_{6} O_{18}} ^{2-}$

Adding Calgon to rough water results in sodium ions being separated from Calgon's anion by hard water calcium and magnesium ions.

$Ca^{2+}$ + ${Na_{4} P_{6} O_{18} }^{2-}$ → $2Na^{+}$ + ${CaNa_{2} P_{6} O_{18} }x^{2-}$

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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