Difference between Free chlorine and Residual chlorine

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·       Residual chlorine and free chlorine is an important parameter and is a measure of the amount of   available chlorine remaining in water system after the chlorination.
·       Residual chlorine is the amount of chlorine that remains in the water after chlorination.
·      When sodium hypochlorite (NaoCl) is dissolved in water it produces hypochlorous acid and     hypochlorite ion.
·      These hypochlorite ions are called as free chlorine.
·      This free chlorine is responsible for the chlorination of the microbes in water.
·      All the free chlorine is not consumed in the chlorination.

·      This remaining chlorine is called residual chlorine.

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