SAC resins are strong acid cation ion exchange resin. These resins are highly ionised in both the acid and salt of the sulfonic acid groups (-SO3H). These resins can convert a metal salt to the corresponding acid through the following process. The hydrogen and sodium forms of strong acid resins are highly dissociated and are readily available for exchange over the entire pH range – the exchange capability of SAC resins are independent of a solution's pH. These resins are used in most softening and full demineralisation applications. This exchange reaction is reversible – the resin can be regenerated with an excess of mineral acid when its capacity is exhausted.
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