First slide

Hardness of water

Question

Polyphosphates are used as water softening agents because

Moderate

A

form soluble complexes anionic species
B

precipitate anionic species
C

form soluble complexes with cationic species
D

precipitate cationic species

Solution

Polyphosphates are used as water softening agents because they form soluble complexes with cations responsible for the hardness of water.

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