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Topic: HOCl breakdown  (Read 3191 times)

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Offline Klipdassie

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HOCl breakdown
« on: January 03, 2018, 09:15:53 AM »
Recently somebody posted a message about the destruction of HOCl with H2O2. In his post he told the usual way to destroy HOCl is with sodium bisulfite. In his post he gave the following reaction to destroy HOCl:

HOCl+NaHSO3→NaCl+H2SO4

To be sure I googled and found two more reactions:

2NaHSO3+2HOCL→H2SO4+2HCL+Na2SO4

and

NaHSO3+HOCL→HCL+NaHSO4

Does this mean all three reactions will take place when you add sodium bisulfite to HOCl or not? ???

Offline chenbeier

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Re: HOCl breakdown
« Reply #1 on: January 03, 2018, 10:06:09 AM »
You have to consider you have a aqueous solution. In this solution you have OCl- and SO3 2-
The redox reaction is to convert this to Cl- and SO42-

H+ and Na+ are spectator cations and will not change. So it doesn't matter you have hydrochloric or sulfuric acid present either Sulfate, chloride and bi sulfate.

Online Borek

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Re: HOCl breakdown
« Reply #2 on: January 03, 2018, 10:53:48 AM »
In other words: behind all the reactions you have listed there is the same net ionic reaction, which describes what is "really" happening.
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Offline Klipdassie

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Re: HOCl breakdown
« Reply #3 on: January 15, 2018, 12:59:31 PM »
Thank you guys,

I was just wondering is there a way to force the reaction in the wanted reaction products (NaCl and H2SO4)?


HOCl+NaHSO3→NaCl+H2SO4

Offline chenbeier

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Re: HOCl breakdown
« Reply #4 on: January 15, 2018, 11:16:31 PM »
Again, in aquaeous solution you have only ions existing.

No solid NaCl or liquid sulfuric acid.  If you would staert to add NaCl to sulfuric then HCl-gas will be developed.

Our reaction will never push in opposit direction.

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