Which one of the following is used for revivi | vedclass

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(D) The exhausted permutite (hydrated sodium aluminium silicate,$Na_2Al_2Si_2O_8 \cdot xH_2O$) contains calcium and magnesium ions that have replaced

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$10\% \,NaCl$ solution

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(D) The exhausted permutite (hydrated sodium aluminium silicate,$Na_2Al_2Si_2O_8 \cdot xH_2O$) contains calcium and magnesium ions that have replaced the sodium ions during the water softening process.To regenerate or revive the exhausted permutite,a concentrated solution of $10\% \,NaCl$ (brine) is passed through it.The high concentration of $Na^+$ ions in the $NaCl$ solution displaces the $Ca^{2+}$ and $Mg^{2+}$ ions from the permutite,restoring it to its original sodium form.

Which one of the following is used for reviving the exhausted permutite?

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