What can gel type cation exchange resin be regenerated with?

The regeneration of gel type cation exchange resin can indeed be accomplished using various chemicals, making “All of the above” the appropriate choice. Gel type cation exchange resins are designed to remove cations from solutions by exchanging them with other cations present in the regenerating solution.

Hydrochloric acid and sulfuric acid are both strong acids capable of providing hydrogen ions (H+) during the regeneration process, which allows the resin to release the accumulated cations it has captured. When the resin is washed with hydrochloric or sulfuric acid, the acid displaces the cations that were bound to the resin, restoring its operational capacity.

Sodium chloride, on the other hand, provides sodium ions (Na+) that can also be used in certain situations for regeneration. In some applications, particularly in water softening, sodium chloride can help to exchange hard water ions, allowing the resin to regenerate by taking up sodium ions in place of the divalent or trivalent cations, such as calcium or magnesium.

Therefore, all the listed substances can be employed to regenerate gel type cation exchange resins, reinforcing the answer that “All of the above” accurately reflects the options available for this regeneration process.