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Calgon used as water softener is...

Calgon used as water softener is

A

`Na_(2)[Na_(4)(PO_(3))_(6)]`

B

`Na_(4)[Na_(2)(PO_(3))_(6)]`

C

`Na_(4)[Na_(4)(PO_(4))_(5)]`

D

`Na_(4)[Na_(2)(PO_(4))_(6)]`

Text Solution

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The correct Answer is:
A
Sodium polymetaphosphate is used to remove the permanent hardness of water. The commercial name of sodium polymetaphosphate is calgon meaning calcium gone. The molecular formula of calgon is `Na_(2)[Na_(4)(PO_(3))_(6)]`.
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