Hypochlorous Acid

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hypochlorous acid

[¦hī·pə′klȯr·əs ′as·əd]
(inorganic chemistry)
HOCl Weak, unstable acid existing in solution only; its salts (such as calcium hypochlorite) are used as bleaching agents.

Hypochlorous Acid


HCIO, a very weak monobasic acid, in which chlorine is in the + 1 oxidation state. Hypochlorous acid is unstable, decomposing gradually even in dilute aqueous solutions. Both the acid and its salts (hypochlorites) are strong oxidizing agents. The crystal hydrate LiClO· H2O withstands prolonged storage. NaClO· H2O decomposes explosively at 70°C, while KClO is known only in the form of aqueous solutions. Ca(ClO)2is completely stable in dry form but decomposes in the presence of water and carbon dioxide. Mg(ClO)2 is more stable. Hypochlorous acid and hypochlorites readily decompose with the liberation of oxygen and thus are commonly used for bleaching pulp and fabrics, as well as for sanitation purposes.

Hypochlorous acid is produced by the hydrolysis of chlorine or by the dissolving of the chlorine oxide Cl2O in water. Calcium hypochlorite, sodium hypochlorite, potassium hypochlorite, and lithium hypochlorite are produced on an industrial scale by the chlorination of milk of lime and the corresponding alkalies.

References in periodicals archive ?
Davies, "Modification of low-density lipoprotein by myeloperoxidase-derived oxidants and reagent hypochlorous acid," Biochimica et Biophysica Acta, vol.
Method of producing and applications of composition of hypochlorous acid [internet].
Another study (6) showed that saturated alkanes can be oxidized by hypochlorous acid in darkness, in a two-phase system, and at relatively low temperatures (0[degrees]C-50[degrees]C).
The present study investigates for the first time the action of arjunic acid, arjungenin and their glucosides, arjunetin and arjunglucoside I, for their free radical scavenging action, their effect on the generation of superoxide from human polymorphonuclear (PMN) cells and hypochlorous acid from human neutrophils.
displayed a new pathogen management system that creates its own hypochlorous acid on-site by mixing carbon dioxide, water and chlorine.
Hypochlorous acid, which is the active disinfectant created with chlorine gas, works better in acidic situations.
For decades, immunologists thought they knew how bacteria-killing cells called neutrophils finished off the microbes they engulfed: Through a so-called respiratory burst, the cells attack bacteria inside them with highly reactive oxygen molecules known as free radicals and with hypochlorous acid, the agent in common laundry bleach.
It said electrodes placed on the side of the washing machine basin produce active oxygen and hypochlorous acid that have cleansing and bacteria-removing properties.
According to Sanyo, the machine uses activated oxygen and electrolyic hypochlorous acid.
The pool became poisoned as gallons of hydrochloric acid and hypochlorous acid was being delivered by Albion Chemicals Distribution, of Glasgow, which recently changed its name from Hays.
Sanyo said that electrodes placed on the side of the washing basin produce active oxygen and hypochlorous acid that have cleansing and bacteria-removing properties.
Decomposition of HOCl at the mg/L level between pH 5 and pH 8 is relatively slow, but in the presence of ultraviolet light, such as sunlight, hypochlorous acid decomposes with a photolysis half-life of 12 minutes at pH 8 and increases as the ratio of hypochlrite ion to hypochlorous acid increases.