explain the softening of water by ion exchange process
Answers
After softening a large quantity of hard water, the exchange medium becomes coated with calcium and magnesium ions.
When this occurs, the exchange medium must be recharged or regenerated.
To recharge the softener with sodium ions, a softener is backflushed with a salt brine solution.
During a backflush, the brine solution replaces the calcium and magnesium ions on the exchange medium with sodium ions from the salt solution.
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Answer:
Water softening is the removal of calcium, magnesium and certain ions in hard water. The resulting soft water is more compatible with soap and extends the lifetime of plumbing and appliances. Water softening is usually achieved using lime softening or ion-exchange resins or reverse osmosis.
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