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Question

Chemistry Question on p -Block Elements

Polyphosphates are used as water softening agents because they

A

form soluble complexes with anionic species

B

precipitate anionic species

C

form soluble complexes with cationic species

D

precipitate cationic species

Answer

form soluble complexes with cationic species

Explanation

Solution

Polyphosphates are used as water softening agents because
they form soluble complexes with cationic species of hard
water.
Na2[Na4(PO3)6]+CaSO4⟶      Soluble complexNa2[(Ca2(PO3)6]+Na2SO4Na_2[Na_4(PO_3 )_6] + CaSO_4\longrightarrow ^{Na_2[(Ca_2(PO_3 )_6]+ Na_2SO_4}_{\, \, \, \, \, \, Soluble\, complex}