Question

calgon method for removal of hardness of water

Answer 1

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.

Answer 2

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}(NaPO3)6 orNa_{2} (Na_{4} P_{6} O_{18} )Na2(Na4P6O18) →2Na^{+}2Na+ +{Na_{4} P_{6} O_{18}} ^{2-}Na4P6O182−

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

Ca^{2+}Ca2+ +{Na_{4} P_{6} O_{18} }^{2-}Na4P6O182− →2Na^{+}2Na+ +{CaNa_{2} P_{6} O_{18} }x^{2-}CaNa2P6O18x2−

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.