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Hypochlorous acid is an inorganic compound with the chemical formula Cl O H, also written as HClO, HOCl, or ClHO. [2] [3] Its structure is H−O−Cl.It is an acid that forms when chlorine dissolves in water, and itself partially dissociates, forming a hypochlorite anion, ClO −.
Lewis structure of a water molecule. Lewis structures – also called Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs) – are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
− OCl + H + ⇌ HOCl. Sodium hypochlorite solutions combined with acid evolve chlorine gas, particularly strongly at pH < 2, by the reactions: HOCl(aq) + Cl − + H + ⇌ Cl 2 (aq) + H 2 O Cl 2 (aq) ⇌ Cl 2 (g) At pH > 8, the chlorine is practically all in the form of hypochlorite anions (OCl −). The solutions are fairly stable at pH 11–12.
In chemistry, hypochlorite, or chloroxide is an anion with the chemical formula ClO −.It combines with a number of cations to form hypochlorite salts. Common examples include sodium hypochlorite (household bleach) and calcium hypochlorite (a component of bleaching powder, swimming pool "chlorine"). [1]
RR′NCl + H 2 O ⇌ RR′NH + HOCl. The quantitative hydrolysis constant (K value) is used to express the bactericidal power of chloramines, which depends on their generating hypochlorous acid in water. It is expressed by the equation below, and is generally in the range 10 −4 to 10 −10 (2.8 × 10 −10 for monochloramine):
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Hypohalous acids tend to be weak acids, and they typically get weaker as the halogen progresses further down the periodic table. Hypochlorous acid has a pK a of 7.53. [5] The pK a values of hypobromous acid is higher (meaning that it is an even weaker acid), [6] at 8.65.