Talk:Magnesium oxide

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Magnesium ribbons[edit]

magnesium ribbons are made of magnesium oxide right? since magnesium oxidises to quickly.--69.170.226.182 21:35, 28 Apr 2005 (UTC)

No they are not! Magnesium ribbon is just Mg cut into strips [ribbons] They are not magnesium oxide: magnesium oxide is a white powdery solid substance, while, magnesium is a silvery meatl with is easily breakable! Hence, they are not the same. 20:35, 9 September 2005 (UTC)

Example experiment is stupid[edit]

Pretty much the least impressive experiment I've ever heard. Heat up some powder, nothing happens. Wow. —Keenan Pepper 16:36, 28 October 2005 (UTC)[reply]

However simple it may be, I have physically done this at my school a few years ago. It's just really a comparison of how burning Mg is easy; and how trying to break down compounds is very hard and requires lots of energy. Kilo-Lima|(talk) 19:26, 19 March 2006 (UTC)[reply]

use for gymnasts and whightlifters[edit]

I allways thougt that magnesium oxide (magnesia usta) is used by sportsman not the carbonate.Stone 15:36, 27 February 2006 (UTC)[reply]

Pretty sure this is incorrect, "Use of 'chalk' in rock climbing: sine qua non or myth?" in Journal of Sports Sciences, makes no mention of MgO and equates rock climbing chalk with Magnesium Carbonate. Unless anyone has any evidence to the contrary I think this claim should be removed from the article. Speekingleesh (talk) 16:08, 21 October 2009 (UTC)[reply]

Used for Migraine Prevention[edit]

My doctor has me taking 400mg twice a day to try and prevent me from getting so many migraine headaches. Ufos8MyCows 13:19, 25 September 2006 (UTC)[reply]

Oddity[edit]

Anyone see the precautions yet? Not me, but wtf.

00:44, 18 November 2006 (UTC)

== what is its enthalpy';;''''

'

well??? 71.62.10.130 01:36, 16 January 2007 (UTC)[reply]

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

Thermodynamic data can be found here: http://webbook.nist.gov/cgi/cbook.cgi?ID=C1309484&Units=SI&Mask=2#Thermo-Condensed No need to be rude. 64.114.134.52 (talk) 19:19, 22 January 2008 (UTC)[reply]

Lattice constant[edit]

A lattice constant with a reference would be nice. I found 4.210 Angström, has somebody a better value? —Preceding unsigned comment added by 134.76.200.193 (talk) 14:12, 11 September 2009 (UTC)[reply]

how about 4.212Å? http://www.2spi.com/catalog/submat/magnesium-oxide.shtml — Preceding unsigned comment added by 149.171.146.24 (talk) 07:54, 17 July 2014 (UTC)[reply]

And http://www.crystec.de/daten/mgo.pdf — Preceding unsigned comment added by 149.171.146.24 (talk) 07:56, 17 July 2014 (UTC)[reply]

Magnesium Oxide and Magnesium carbonate[edit]

Are these the same? TwinkleToes10 (talk) 01:04, 28 September 2009 (UTC)[reply]

Nope. Oxide is MgO and carbonate is MgCO3. Materialscientist (talk) 01:10, 28 September 2009 (UTC)[reply]

dessicants[edit]

Typically highly hygroscopic materials are used as dessicants. Deliquescent chemicals like calcium chloride or surface active materials like silica gel have the capacity to significantly reduce the relative humidity (water activity) around them. Magnesium oxide does absorb water, but only slowly and to higher activity than these others. However it has certain advantages for paper becuase it does not deliquesce or pull pH very far (pH 10) from neutral.

Yellier — Preceding unsigned comment added by Yellier (talk • contribs) 11:35, 12 July 2011 (UTC)[reply]

Incorrect characterization of solid MgO[edit]

The sentence "It is formed by an ionic bond between one magnesium and one oxygen atom." is incorrect. Only in the gaseous state would such a species exist. A more acceptable statement would be something like this "Solid MgO consists of a lattice of Mg2+ ions and O2- ions held together by strong ionic bonds." Tgcorley (talk) 18:03, 9 September 2011 (UTC)[reply]

Thanks. Changed, in some trimmed form - it was already saying that MgO is a solid. Materialscientist (talk) 22:11, 9 September 2011 (UTC)[reply]

Heavy magnesium oxide vs. light magnesium oxide[edit]

I'm having a hard time finding information on the difference between heavy magnesium oxide and light magnesium oxide. What I've found so far is that magnesium oxide is found in two forms, with one being more dense than the other. Does anybody know about any structural or functional differences between the two, or specifically what makes one form more dense than the other? — Preceding unsigned comment added by 208.37.148.98 (talk) 22:25, 2 February 2012 (UTC)[reply]

Hm .. it is not crystal structure. Both terms refer to powders, not crystals, and heavy MgO is heated to higher temperatures during production - this should reduce porosity and water content. Materialscientist (talk) 00:41, 3 February 2012 (UTC)[reply]

Only insofar that dead burnt magnesia is denser and occupies less volume than light burnt magnesia, which because of its very high surface area and propensity to attract a static electrical charge, repels other particles to form a 'fluffy' material of low density. Without some method of compaction to remove entrained air - it remains light magnesium oxide since it is difficult to put any significant mass into a container, bag or similar vessel. — Preceding unsigned comment added by Steelaway (talk • contribs) 06:25, 16 February 2015 (UTC)[reply]

Better reference for MgO being used to preserve books[edit]

[Conservation page] Eagleapex (talk) 20:12, 10 December 2012 (UTC)[reply]

Hydroscopic - seriously in error[edit]

Magnesium oxide is definitely NOT hydroscopic according to the ordinary definition. The confusion may be because its close relative magnesium chloride IS hydroscopic. The hydration of MgO to the hydroxide is very slow and certainly does NOT occur at anything like the rate associated with hydroscopic compounds. ~~ — Preceding unsigned comment added by Steelaway (talk • contribs) 06:20, 16 February 2015 (UTC)[reply]

What "ordinary" definition are you referring to? Just because the reaction is slow does not mean that it is not hygroscopic. I work with MgO, and have to keep it in a dessicator to avoid hydration.

KE7KTO (talk) 19:49, 25 May 2016 (UTC)[reply]

low bioavailability in nutrition supplements[edit]

In the area of nutrition supplements, Magnesium oxide is infamous for being very cheap and common but having extremely low bioavailability, and thus nearly useless for nutrient purposes. The article should mention this significant aspect.-71.174.180.38 (talk) 18:11, 6 September 2016 (UTC)[reply]

The comparative bioavailabilities of various forms of magnesium supplements is not well researched, and therefore not established with certainty. This 2017 review examines that issue: Intestinal Absorption and Factors Influencing Bioavailability of Magnesium-An Update Nicmart (talk) 20:32, 21 July 2020 (UTC)[reply]

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