pBlock ElementsII - Result Question 27
####27. Polyphosphates are used as water softening agents because they
(2002, 3M)
(a) form soluble complexes with anionic species
(b) precipitate anionic species
(c) form soluble complexes with cationic species
(d) precipitate cationic species
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Solution:
- Polyphosphates are used as water softening agents because they form soluble complexes with cationic species of hard water. $Na _2\left[Na _4\left(PO _3\right) _6\right]+CaSO _4 \longrightarrow \underset{\text { Soluble complex }}{Na _2\left[\left(Ca _2\left(PO _3\right) _6\right]+Na _2 SO _4\right.}$
