MCQ
Polyphosphates are used as softening agents since
- ✓They forms soluble complex with cationic species
- BThey forms soluble complex with anionic species
- CThey forms ppt with cationic species.
- DThey forms ppt with anionic species.
✓
Answer
Correct option: A.
They forms soluble complex with cationic species
a
Polyphosphates are used to remove calcium sulphate and magnesium sulphate impurities from water.
Polyphosphates are used to remove calcium sulphate and magnesium sulphate impurities from water.
It forms a soluble complex with cation and removes the hardness of the water.
The reactions involved are:
$2 CaSO _4+ Na _2\left[ Na _4\left( PO _3\right)_6\right] \rightarrow Na _2\left[ Ca _2\left( PO _3\right)_6\right]+2 Na _2 SO _4$
$2 MgSO _4+ Na _2\left[ Na _4\left( PO _3\right)_6\right] \rightarrow Na _2\left[ Mg _2\left( PO _3\right)_6\right]+2 Na _2 SO _4$
Polyphosphate makes a soluble complex with $Ca ^{+2}$ and $Mg ^{+2}$ and removes the hardness of water caused by calcium sulfate and magnesium sulphate.
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