Briefly answer each of the following:
(e) How does passing a saturated NaCl solution through a "spent" ion-exchange resin regenerate the resin?
Answer:
Such spent ion-exchange resin can be regenerated using a regenerant solution 186 comprising sodium chloride, that is, a brine solution of water with dissolved sodium.
The ion exchange is performed via a polymer inside the form of tiny spheres which might be capable of changing unique ions for different ions, in an answer that passes through them. these artificial gel spheres are called “Ion exchange Resins”. This exchange ability is also discovered in diverse natural structures, which include soils and living cells. artificial resins are not best used for water purification, but also for diverse different programs that encompass the separation of a few elements.
In water purification, the main purpose is to melt the water or do away with the mineral content. The water is softened via the usage of a resin that includes sodium cations (Na+), and exchanges them for calcium Ca2+ and magnesium Mg2+ (hardness).
As the water passes thru the resin, Ca uptake increases2+ and Mg2+ till the resin is saturated, at this factor it is important to regenerate the resin, charging it once more with Na+.
The strategies that use ion exchange are the following:
Water softener (hardness elimination)
De-alkalization (do away with carbonates)
De-cationization (elimination of all cations)
Demineralization (removal of all ions)
combined mattress (Nitrates and demineralization)
dispose of metals.
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