Environmental Engineering Reference
In-Depth Information
Calcium hypochlorite reaction with water
H
2
O
water
Ca(OCl)
2
calcium
hypochlorite
2HOCl
hypochlorous
acid
Ca(OH)
2
calcium
hydroxide
+
→
+
(Eq. 2-3)
Hypochlorous acid dissociation reaction
OCl
_
hypochlorite ion
H
+
HOCl
hypochlorous acid
(Eq. 2-4)
↔
+
Low pH
High pH
Figure 2-1
pH effect on chlorine species
An important observation is that liquid chlorine (gas under
pressure in cylinders) produces an acid in its reaction with water.
This results in a lower pH that favors the more effective form of
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