Talk:Sodium hypochlorite

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Misprint?[edit]

Near the end of the nineteenth century, E. S. Smith patented a method of hypochlorite production involving hydrolysis of brine to produce caustic soda and chlorine gas, which then mixed to form hypochlorite.[citation needed] Both electric power and brine solution were in cheap supply at this time, and various enterprising marketers took advantage of this situation to satisfy the market's demand for hypochlorite.

Maybe electrolysis? It looks like a misprint. --159.148.226.100 (talk) 20:08, 6 March 2011 (UTC)

As no one has commented this I will now edit, preserving "hydrolysis" as comment. "citation needed" tag was already present. --159.148.226.100 (talk) 07:25, 8 March 2011 (UTC)

I think Hydrolysis is the correct term.Longinus876 (talk) 11:56, 12 May 2015 (UTC)

Reaction with Alcohols[edit]

In undergrad labs we used NaOCl and reacted it with glacial acetic acid to form HOCl which maintains an equilibrium between HOCl and H2OCl+ (The H2O will not form a leaving group because the chloride ion does not have the electrons required to leave) which can oxidize alcohols to carbonyls without the use of a catalyst. I don't have a source for this other than a powerpoint presentation I can still access from my universities lab website though. Figure this would be important to add since it is not even mentioned on the hypochlorous acid page, but this page mentions the use of NaOCl to oxidize alcohols to carbonyls. I've only used it to form ketones but I imagine it works with aldehydes Kasooi (talk) 21:51, 30 July 2011 (UTC)

Chemical States[edit]

I am not a frequent contributor, so I won't make the changes myself, but I feel like the reactions section would greatly benefit from giving the chemical state of each reagent (ie: (g), (s), (l), (aq)...). This would clarify the reactions shown for better layperson understanding of what the products of some of these reactions are. — Preceding unsigned comment added by 76.115.177.0 (talk) 20:56, 25 March 2012 (UTC)

Hooker process[edit]

Hooker process should link to this page, if it doesn't get it's own stub.
~ender 2012-05-26 9:58:AM MST — Preceding unsigned comment added by 98.165.52.42 (talk)

General information for introductory paragraph[edit]

There appears to be significant omissions from the introduction. Basic characteristics like electrophilic, basic and so on are not even hinted at. As a chemical, surely these kind of attributes should be outlined in the introduction. It just jumps straight into production, before any brief synopsis of usage aswell. To me this seems poor. There are many wiki article which include information like this in the introductions like Hydrocholirc acid:

http://en.wikipedia.org/wiki/Hydrochloric_acid

or sodium chloride:

http://en.wikipedia.org/wiki/Sodium_chloride

Would someone who is more confident with the chemistry and usage of sodium hypochlorite please sort this? 90.193.233.41 (talk) 14:20, 29 August 2012 (UTC)

Boiling point and decomposition temp[edit]

The article currently gives a boiling point for NaOCl of 101°C. However the "Handbook of Preparative Inorganic Chemistry" 2nd Ed. by G. Brauer (page 309) would imply that for the pentahydrate, decomposition to NaCl and NaClO3 takes place anywhere above 0°C. Obviously household bleach is stable above this temperature, so dilution is clearly a factor, but a stability of 101°C seems very high. Most of the literature on stability is in relation to endodontics and doesn't discuss solutions above 5%. Does anyone have access to better references? Project Osprey (talk) 12:04, 11 September 2013 (UTC)

Production: Electrolysis[edit]

I understand that the "same reactants" can yield different results: ethanol + sulfuric acid = {ethylene, diethyl ether} depending on temperature. But the entries for sodium hypochlorite sodium chlorate and sodium perchlorate all pretty much say that they're created the same way. Can someone knowledgeable on this topic put in the differentiating conditions? — Preceding unsigned comment added by 68.32.223.91 (talk) 02:13, 29 September 2014 (UTC) — Preceding unsigned comment added by 68.32.223.91 (talk)

The conditions are different. (Emphasis added)
From Sodium hypochlorite#Production: (The Hooker process)
In the process, sodium hypochlorite (NaClO) and sodium chloride (NaCl) are formed when chlorine is passed into cold and dilute sodium hydroxide solution. The solution must be kept below 40 °C (by cooling coils) to prevent the undesired formation of sodium chlorate.
Cl2 + 2 NaOH → NaCl + NaClO + H2O
From Sodium chlorate#Synthesis:
Industrially, sodium chlorate is produced by the electrolysis of a hot sodium chloride solution:
NaCl + 3 H2O → NaClO3 + 3 H2
This reaction progresses in heat (at least 70 degrees Celsius), and controlled pH.
From Sodium perchlorate#Production:
Sodium perchlorate is produced by anodic oxidation of sodium chlorate, not sodium chloride, at an inert electrode, such as platinum.
ClO3(aq) + H2O(l) → ClO4(aq) + H2(g)
I hope this helps. Tomásdearg92 (talk) 10:09, 30 September 2014 (UTC)

storage of household bleach[edit]

"Household bleach sold for use in laundering clothes is a 3–8% solution of sodium hypochlorite at the time of manufacture. Strength varies from one formulation to another and gradually decreases with long storage."

This is very practical, helpful information. It would be even better if it indicated how fast the concentration declines with time under typical household storage conditions (months-years) and what variables may influence this the most. Storage in glass vs. plastic? How tight the lid is? Temperature? And it would be good to have the physical-chemical details of what is happening over time - what chemicals are being produced, in what forms and what concentrations? (Some readers will have in hand a partial container of bleach which has sat neglected for years, wanting to understand what is likely to be inside now.)-71.174.183.177 (talk) 20:21, 13 February 2015 (UTC)

Please see what Wikipedia is not. Wikipedia is not intended to provide exhaustive information on the degredation of household chemicals, their storage, safety or disposal. Anything resembling a how-to guide or medical advice is strongly advised against. If you or any others have a theoretical question to ask, you can always ask it at the Wikipedia:Reference Desk. Tomásdearg92 (talk) 16:40, 15 February 2015 (UTC)