In the brine regeneration process, which cations are exchanged on the resin by sodium?

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Multiple Choice

In the brine regeneration process, which cations are exchanged on the resin by sodium?

Explanation:
In brine regeneration, the resin that softens water is a cation exchanger loaded with sodium. The regenerant brine, rich in sodium ions, drives the exchange so that sodium on the resin is replaced by calcium and magnesium from the water. This restores the resin’s capacity to remove hardness and pushes the calcium and magnesium into the regenerant waste. Other options describe exchanging iron or exchanging anions, which aren’t part of this cation-exchange regeneration step.

In brine regeneration, the resin that softens water is a cation exchanger loaded with sodium. The regenerant brine, rich in sodium ions, drives the exchange so that sodium on the resin is replaced by calcium and magnesium from the water. This restores the resin’s capacity to remove hardness and pushes the calcium and magnesium into the regenerant waste. Other options describe exchanging iron or exchanging anions, which aren’t part of this cation-exchange regeneration step.

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