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Calcium hypochlorite is put into water, and releases Chlorine, which disinfects the Water. Here is the equation for the total process:

Ca(ClO)2 + H2O ----> Ca(OH)2 + HClO

HClO ----> HCl + [O] ----> H2O + Cl2

First Calcium hypochlorite reacts with water to produce the unstable oxidizer Hypochlorous acid. This compound decomposes to Hydrochloric acid and Nascent oxygen. Nascent oxygen then oxidizes Chloride ions in Hydrochloric acid to Chlorine. This Chlorine comes out in the form of bubbles and kills all harmful organisms in the contaminated water.

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