AJKOER
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Action of Nascent Hydrogen on Hypochlorite
I just find a possible confirmation of the reaction of the hydrogen radical also referred to as the hydrogen atom or H chemisorbed (see https://www.sciencemadness.org/whisper/viewthread.php?tid=10... ) and also nascent hydrogen, acting upon hypochlorite. My suggested reaction is:
∙H + OCl- --> ∙OHCl-
A reference for the above radical can be found at https://www.sciencemadness.org/whisper/viewthread.php?tid=15... .
At pH > 5, the above radical decomposes as follows:
∙OHCl- --> ∙OH + Cl-
Partial confirmation from a dated source, namely Mellor (see https://books.google.com/books?id=8w1GAQAAMAAJ&pg=PA278&... ) who notes that the action of nascent hydrogen, as created in electrolysis, on
hypochlorite does result in an increase in chloride.
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For completeness at pH < 5 (more acidic conditions):
∙OHCl- --> OH- + ∙Cl
∙Cl + ∙Cl = Cl2
Cl2 + H2O = HCl + HOCl
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[Edited on 4-12-2019 by AJKOER]
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Ubya
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ok
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feel free to correct my grammar, or any mistakes i make
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DraconicAcid
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Nascent hydrogen can reduce hypochlorite to chloride? What a discovery!
This solves all my challenging difficulties in finding a convenient way to generate chloride ion in situ!
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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unionised
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I suspect there may be a competing reaction.
H. + H2O --> OH. + H2
However, even if I'm wrong it's hard to see the reaction with OCl- as useful.
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AJKOER
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Accepting the nascent hydrogen path to the ∙OHCl- radical and its decomposition products in addition to chloride:
∙OHCl- ---> .OH + Cl- (pH >5)
also implies an active presence of hydroxyl radicals. And further reactions in the presence of hypochlorite creating its radical counterpart:
∙OH + OCl- ---> OH- + ∙OCl
And, a set of radical reactions:
∙OCl + ∙OCl = (OCl)2 or (ClO)2
∙OCl + ∙OCl = O2 + Cl2
∙OCl + ∙OCl = ∙ClOO + ∙Cl
∙OCl + ∙OCl = ∙OClO + ∙Cl
where ∙OClO is more frequently written as ClO2, where chlorine dioxide is a precursor to chlorates (as is also the process of electrolysis of
hypochlorite a path to ClO3- per Mellor).
So, one possible implication, as there are many paths to .H other than, for example, electrolysis, it follows there could be several competing paths
to chlorate as well. Note, while some hydrogen radical presence may add to favorably to radical activity, an excess of .H itself may directly consume
formed chlorate!
[Edited on 4-12-2019 by AJKOER]
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AJKOER
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Quote: Originally posted by unionised  | I suspect there may be a competing reaction.
H. + H2O --> OH. + H2
However, even if I'm wrong it's hard to see the reaction with OCl- as useful. |
It is best to view .H as an operating couple (e-,H+) as:
H+ + e- = .H
in an apparent equilibrium reaction, in my assessment. So, its reaction with water:
(e-,H+) + (H+ + OH-) = .H + H2O
and the hydrogen radical could regenerate itself barring the termination reaction:
.H + .H --> H2
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Also, the action of (e-,H+) on hypochlorite in steps:
(e-,H+) + OCl- = e- + HOCl
e- + HOCl = .OHCl-
which some may find more preferable than my proposed reaction in the opening of this thread:
∙H + OCl- --> ∙OHCl-
[Edited on 4-12-2019 by AJKOER]
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