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Calgon used as a water softener is

1. (a) Na2[Na4(PO3)6]
2. (b) Na4[Na2(PO4)6]
3. (c) Na4[Na4(PO4)5]
4. (d) Na4[Na2(PO4)6]

Correct answer: (a) Na2[Na4(PO3)6]

Solution

Calgon, a water softener, is chemically represented as Na2[Na4(PO3)6], which is a complex phosphate used to remove calcium and magnesium ions from hard water.

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