Talk:Sodium hydroxide

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Contents

[edit] Reference to Edward Gorey (R.I.P.) in somewhere?

Well, I basically summed everything up in the title. Should there be mention of the Ghashlycrumb Tinies in which one child "Takes lye by mistake"? --Arkracer 21:46, 17 November 2006 (UTC)

[edit] Use of Sodium Hydroxide in Food and Consumer Goods

Could someone please give some detail about how sodium hydroxide is used in cleaning the flesh off of bones? --Cyberman 22:16, 10 July 2005 (UTC)

If lye is poisonous, how do they contrive to make food with it? - Montréalais 23:30, 1 Nov 2004 (UTC)

Topol whitening toothpaste contains sodium hydroxide. I know toothpastes usually have a myrid of chemicals, but is Sodium Hydroxide useful in teeth whitening? [Ingredient Reference]


Both this page and the KOH say their compound is more commonly used for biodiesel because it does not clump as much. They can't both be right.

Moved this text:

It is also a traditional ingredient in the making of soap, and for this
 purpose was historically obtained in an impure form by steeping wood ash in 
 water for a long period.

to the KOH entry and added a bit to this entry about the confusion of NaOH and KOH by both of them being called "lye."

As far as food poisoning, I'm stumped; the article should mention this, if only for safety reasons. As for cleaning flesh off bones...ewwwwww....but sure.

"German pretzels are poached in a boiling sodium hydroxide solution before baking, which contributes to their unique crust." This is quite simply not true, although a wide-spread misunderstanding. Sodium Hydroxide, NaOH aka E524, is always used in a room-temperature solution. This is the most common substance used for German "Laugenbrezen". One could use baking soda, NaHCO₃ aka E500, instead, and this would be used in a boiling solution. This is extremely uncommon, howewer, as the risk of injury would be considerably higher. Handling a room-temperature solution is considerably safer. A really good source - in German, alas - is http://www-pool.math.tu-berlin.de/~boerner/kulinarisches/laugengebaeck_de.php?s=begriffe. YorickDowne 18:10, 21 February 2007 (UTC)

[edit] About language and communication of ideas.

I would like to see some text here about lye. How was the substance originally created/discovered? What was it originally used for? From which base substances is lye commonly created from today...?

So often in the field of chemistry, the conversation deteriorates into a speculative maze of generalized theories of chemical interaction. I find it more educational to hear of known observations and known physical building blocks of chemicals in terms of the real hands on knowledge that a person has who works in a factory.

This genre of writing would communicate more effectively to casual readers who are interested about these guild issues. --- Rainbird 21:12, 28 Sep 2004 (UTC)


Just out of curiosity, is the scenario portrayed with lye in "fight club" (about the chemical lye burn) realistic? does it burn that fast? --2tothe4 20:37, 27 September 2005 (UTC)

[edit] Basic chemical data needs attention

What would be the effect of using sodium hydroxide, rather than sodium carbonate, to raise the pH of a solution after acidification with HCl? can someone please answer this question?

The sidebar on the left of the page isn't that well developed; a picture especially is nice. If you need an example try Hydrochloric acid. HereToHelp 20:38, 28 September 2005 (UTC)

Yes, it's on our list of things to do- but that list has 380 chemicals on it! The HCl page uses our standard table, this page uses someone's own design, and it needs updating. We should get to it fairly soon, since NaOH is important. Walkerma 21:09, 28 September 2005 (UTC)
I just added the proper chembox. Now only to fill in the data from the old to the new. Do you CareToHelp, HereToHelp? Wim van Dorst 21:16, 28 September 2005 (UTC).
Beat you to it. Next time just dig in. Wim van Dorst 22:16, 28 September 2005 (UTC).

[edit] Corrosive Properties of sodium hydroxide

Is anyone familiar with how long the corrosive properties of sodium hydroxide are active once water has been added? Also, once the water is evaporated from the solution, if water is added again, will it reactivate the corrosive properties of the sodium hydroxide?

One point straight away: sodium hydroxide always contains water: the commercial solid is about 15% water and is deliquescent, that is it will absorb water from the atmosphere to the extent that it dissolves in it.
In the European Union, sodium hydroxide solutions are classified as corrosive if they contain more than 2% NaOH (0.5 M), and as irritant if they contain 0.5–2% NaOH (0.125–0.5 M) (source: European Chemicals Bureau). Physchim62 19:55, 14 October 2005 (UTC)

[edit] Use in Biodiesel

My employer makes biodiesel. According to him and other internet sources NaOH is most typically in smaller operations because it is readily available in the form of Red Devil Drain cleaner. Clunping is not a problem if used with Methenol, but if Ethenol is used KOH must be substituted do to coagulation.

[edit] Highly reactive yet relatively stable?

Read the 2nd and 3rd paragraphs. Was "stable" meant to be "reactive"? Also, at the end of the 2nd paragraph: "Therefore, it should be stored separately." From what? Why? Twilight Realm 22:39, 12 October 2005 (UTC)

[edit] Use in soap

I'm guessing that in soap, it is in a very low concentration. Correct? Twilight Realm 22:46, 12 October 2005 (UTC)

  • In the finished soap, it is to all intents and purposes absent, as it is consumed during the manufacturing process. Physchim62 06:31, 14 October 2005 (UTC)

--Correct, home-made soap usually contains an excess of 5% to 8% of more fat than the amount of NaOH used can saponify. In a batch of 2 lbs. of soap, you can end up using somewhere inbetween 4 oz. to 5 oz. depending on what oils you use. Each oil (palm, olive, apricot, the list goes on) has a different saponification value, so differing amounts of lye would saponify 1 oz. of olive oil and 1 oz. of palm oil.

[edit] For those trying to improve this page

Try visiting [1] and [2] for information. Twilight Realm 22:58, 12 October 2005 (UTC)

[edit] "Lime" Disambiguation

In the Related Compounds section at the side, we have Ammonia Lime (each word linked separately). I'm attempting to update links to the disambiguation page for Lime, but I don't know what Ammonia Lime is. Googling for it's turned up blanks. Is it CaO? Can someone update this when they find out? --138.38.32.84 17:47, 2 February 2006 (UTC)

They are meant to be two separate items: ammonia and lime (calcium hydroxide). Edgar181 17:51, 2 February 2006 (UTC)

Since Titanium is highly unreactive as compared to iron, copper and aluminium, why does it react with NaOH whereas iron and copper do not?

[edit] Precautions

When water is added to lye, it produces heat and will burn flesh. Why does the precautions section tell people to wash with water in case of contact with skin? Why does it suggest that vinegar will burn? This is not funny. I'm changing the text- if you have a problem with it, cite a legitimate source. Juicifer451 14:16, 15 August 2006 (UTC)

Good revision.Juicifer451 18:01, 15 August 2006 (UTC)

Thanks. This has been done now on several articles. Safety should really be a small part of the text, we can't be complete, and if there are errors .. so I axe it down. If people need safety information, they can look it up in an MSDS (the link in the chembox should be working, and otherwise, there is Wikipedia:Chemical sources). See you around! --Dirk Beetstra T C 18:05, 15 August 2006 (UTC)

[edit] Men of Honor

No reference in Men of Honor to a deleted lye scene. DavidBofinger 02:39, 16 October 2006 (UTC)

OK, I deleted it. Trivia sections are widely regarded as frivolous, and lye is hardly an obscure substance - it probably appeared in several non-deleted movie scenes! Not really notable or even amusing anyway IMHO. Walkerma 03:22, 16 October 2006 (UTC)

[edit] Men served fries doused in lye

"It was an accident, but they served these people french fries with sodium hydroxide instead of vinegar"[3] -- noosphere 22:36, 30 December 2006 (UTC)

[edit] History of Soap

The text currently reads:

Soap making via saponification is the most traditional chemical process using sodium hydroxide. The Arabs began producing soap in this way in the 7th century, and the same basic process is still used today.

I've heard this claim before, I think even in reliable sources (though I don't remember which), but as Roman, Egyptian, and apparently even mesopotamian sources mention the mixing of ashes and fat to make soap, I'm not sure what is meant. Were the arabs the first to chemically isolate Sodium hydroxide maybe? --Iustinus 02:18, 31 December 2006 (UTC)

[edit] NaOH + HCl -> NaCl + H20?

Is this worth mentioning? NaOH + HCl -> NaCl + H20? 71.168.108.66 21:33, 22 January 2007 (UTC)

[edit] Is this correct?

Is this: [4] change from 0.2 to -2.43 by an anonymous user correct? JohJak2 09:50, 2 February 2007 (UTC)

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