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What is the Formula for Permutit or zeolite which is used as a Softer ion-Exchange Method

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Answer:

Zeolites are any member of the hydrated aluminosilicate mineral family that contains alkali and alkaline-earth metals.
Permutit is also known as synthetic zeolite or man-made zeolite.
Zeolite is expressed as Na2.Al2O3.nSiO2.xH2O in its chemical formula.
When water travels through the permutit, the ions in the compound exchange.
This means that the sodium and aluminium ions in the permutit replace the calcium and magnesium ions in hard water.
The reaction that follows occurs.

Na2.Al2O3.nSiO2.xH2O + Ca2+or Mg2+CaAl2Si2O8.xH2O + Na+

As a result, the permutit or zeolite formula employed as a softener in the ion-exchange technique is Na2.Al2O3.nSiO2.xH2O.