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When hard water is passed through permut...

When hard water is passed through permutit, which ions are exchanged with `Ca_2` and `Mg^(2+)`?

A

`Na^+`

B

`Al^3+`

C

`H^+`

D

`K^+`

Text Solution

Verified by Experts

The correct Answer is:
A
For the softening of water by permutit process, the water is percolated through the bed of zeolite packed in a vertical cylinder. The zeolite may be represented as `Na_2Z` and the following reactions occur in the zeolite bed:
`Na_2Z + CaSO_4 (or CaCl_2) to CaZ + Na_2SO_4 (or 2NaCl)`
`Na_2Z + MgCl_2 (or MgSO_4) to MgZ + 2NaCl (or Na_2SO_4)`
`Na_2Z + Ca(HCO_3)_2 (or Mg (HCO_3)_2) to CaZ (or MgZ) + 2NaHCO_3`
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