Polyphosphates are used as water softening agents because

1.	Polyphosphates are used as water softening agents because
A.	form soluble complexes anionic species
B.	precipitate anionic species
C.	from soluble complexes with cationic species
D.	precipitate cationic species
Answer» D. precipitate cationic species

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Polyphosphates are used as water softening agents because

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