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The formula for the reaction with disodium cartbonate does not corresponds to the basic forms mentioned in the previous "Forms" section! — Preceding unsigned comment added by 150.227.15.253 ( talk) 18:52, 19 December 2016 (UTC)
I always thought that magnesium oxide (magnesia Gusta) is used by sportsman not the carbonate. Stone 15:32, 27 February 2006 (UTC)
I came to this page because magnesium carbonate is apparently an additive to "Formula 303." I was kind of amused to find out that it is better known as "chalk" only after reading through all the discussion of chemistry and obscure uses as a product additive. Kind of like having an article on hydrogen oxide and only mentioning it's known as "water" most of the way down the page. thank you. 66.93.209.195 17:38, 21 October 2006 (UTC)
It should be mentioned that the optical diffusion property of this "chalk" is the reference used to describe the reflective characteristics of projection screens. As the reference, magnesium carbonate is given a "gain" of "1" which equates to an evenly diffuse reflection of light off of its surface out to 180 degrees (+/-90 deg). A front projection screen typically concentrates the reflected light out to an angle less than 180 degrees, resulting in an increased brightness to the viewer. A screen may then be described as having a "gain" of more than "1" (a gain of 1.3 to 1.5 is fairly common). Personally, I think the use of the word "gain" is misleading because it implies more light coming off the screen than what is striking it. So there. Anyway, I'll have to leave it to others to cite references and all that. 74.10.115.30 ( talk) 00:07, 25 July 2008 (UTC)
-- 222.64.222.67 ( talk) 10:39, 31 January 2010 (UTC)
-- 222.64.222.67 ( talk) 10:53, 31 January 2010 (UTC)
Love a comment from a Magnesium carbonate guru on this article on 'upsalite': http://www.huffingtonpost.com/2013/08/05/upsalite-impossible-material-swedish-lab_n_3709055.html In what way is it different from other forms of magnesium carbonate? Sanpitch ( talk) 16:36, 9 August 2013 (UTC)
I'd like more context on the solubility product. I have looked all over the web and I have seen it quoted in basically 2 flavours: one is in the range of 6x10^-6, and the other one is in the range of 3x10^-8. The info in the wikipedia article seems to align with the latter camp. However, why so much discrepancy? These are 2 orders of magnitude difference! Are there different standard states or assumptions behind these values? 212.60.196.82 ( talk) 07:39, 9 March 2017 (UTC)
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In the "Forms" section, it writes the formula of nesquehonite, the trihidrate of magnesium carbonate, is MgCO3·3H2O, but suddenly in the "Chemical properties"/"Decomposition" section writes the formula of the same chemical may be written as Mg(HCO3)(OH)·2H2O, confusing students is the molecular formula of nesquehonite MgCO3·3H2O or Mg(HCO3)(OH)·2H2O, which are two distinct chemicals. That imports confusion (suspicion) are the molecular formulas of other hydrates (ammines, and other complexes) of magnesium carbonates, and all metal carbonates, sulfates, phosphates and other salts and other chemical compounds, all across the Wikipedia website, really true.
Bernardirfan ( talk) 15:03, 6 May 2022 (UTC)
The top of the infobox depicts - supposedly - the structure of magnesium carbonate as the side-by-side Mg(+2) cation and the CO3(-2) anion. This is simply wrong. I don't know if this issue - depicting ionic solids as simple ion pairs - has been settled on Wikipedia, but if so, it is wrong. Most obviously because the CO3 anion has 3 identical bonds, not the single double bond with two bonds to negatively charged oxygens. It is simply not true that an ionic solid can or should be depicted as an cation+anion pair. (I note that some ionic solids may exist in the gaseous state as a (covalent) pair or commonly multiple pairs.) The problem is that the *formal* structure isn't usually an accurate portrayal of the actual structure. Ionic solids exist as anions surrounded by cations and cations surrounded by anions (as a first approximation). That is, they exist as crystals structures or lattices of ions. I don't understand why the infobox contains anything other than Mg(-2) CO3(-2) since that is, indeed, its formal formula. (no structure, no juxtaposition). Again, the Mg ion isn't bare (it is surrounded by MORE than one (equivalent) carbonate ion nor is the Carbonate ion associated with a single cation. This *could* be displayed, but it's not clear to me that such a display would be useful. I'll finally note that the crystal structure is claimed to be "trigonal", and while I have not checked that, I do know that there are 5 point groups and 25 space groups that are "trigonal". That is: the crystal structure is greatly underspecified. 174.130.71.156 ( talk) 23:01, 28 October 2022 (UTC)
Carbonate coordination | Magnesium coordination | Unit cell | Packing |
---|---|---|---|
This article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||||||
|
The formula for the reaction with disodium cartbonate does not corresponds to the basic forms mentioned in the previous "Forms" section! — Preceding unsigned comment added by 150.227.15.253 ( talk) 18:52, 19 December 2016 (UTC)
I always thought that magnesium oxide (magnesia Gusta) is used by sportsman not the carbonate. Stone 15:32, 27 February 2006 (UTC)
I came to this page because magnesium carbonate is apparently an additive to "Formula 303." I was kind of amused to find out that it is better known as "chalk" only after reading through all the discussion of chemistry and obscure uses as a product additive. Kind of like having an article on hydrogen oxide and only mentioning it's known as "water" most of the way down the page. thank you. 66.93.209.195 17:38, 21 October 2006 (UTC)
It should be mentioned that the optical diffusion property of this "chalk" is the reference used to describe the reflective characteristics of projection screens. As the reference, magnesium carbonate is given a "gain" of "1" which equates to an evenly diffuse reflection of light off of its surface out to 180 degrees (+/-90 deg). A front projection screen typically concentrates the reflected light out to an angle less than 180 degrees, resulting in an increased brightness to the viewer. A screen may then be described as having a "gain" of more than "1" (a gain of 1.3 to 1.5 is fairly common). Personally, I think the use of the word "gain" is misleading because it implies more light coming off the screen than what is striking it. So there. Anyway, I'll have to leave it to others to cite references and all that. 74.10.115.30 ( talk) 00:07, 25 July 2008 (UTC)
-- 222.64.222.67 ( talk) 10:39, 31 January 2010 (UTC)
-- 222.64.222.67 ( talk) 10:53, 31 January 2010 (UTC)
Love a comment from a Magnesium carbonate guru on this article on 'upsalite': http://www.huffingtonpost.com/2013/08/05/upsalite-impossible-material-swedish-lab_n_3709055.html In what way is it different from other forms of magnesium carbonate? Sanpitch ( talk) 16:36, 9 August 2013 (UTC)
I'd like more context on the solubility product. I have looked all over the web and I have seen it quoted in basically 2 flavours: one is in the range of 6x10^-6, and the other one is in the range of 3x10^-8. The info in the wikipedia article seems to align with the latter camp. However, why so much discrepancy? These are 2 orders of magnitude difference! Are there different standard states or assumptions behind these values? 212.60.196.82 ( talk) 07:39, 9 March 2017 (UTC)
Hello fellow Wikipedians,
I have just modified 2 external links on Magnesium carbonate. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
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have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 05:47, 30 May 2017 (UTC)
In the "Forms" section, it writes the formula of nesquehonite, the trihidrate of magnesium carbonate, is MgCO3·3H2O, but suddenly in the "Chemical properties"/"Decomposition" section writes the formula of the same chemical may be written as Mg(HCO3)(OH)·2H2O, confusing students is the molecular formula of nesquehonite MgCO3·3H2O or Mg(HCO3)(OH)·2H2O, which are two distinct chemicals. That imports confusion (suspicion) are the molecular formulas of other hydrates (ammines, and other complexes) of magnesium carbonates, and all metal carbonates, sulfates, phosphates and other salts and other chemical compounds, all across the Wikipedia website, really true.
Bernardirfan ( talk) 15:03, 6 May 2022 (UTC)
The top of the infobox depicts - supposedly - the structure of magnesium carbonate as the side-by-side Mg(+2) cation and the CO3(-2) anion. This is simply wrong. I don't know if this issue - depicting ionic solids as simple ion pairs - has been settled on Wikipedia, but if so, it is wrong. Most obviously because the CO3 anion has 3 identical bonds, not the single double bond with two bonds to negatively charged oxygens. It is simply not true that an ionic solid can or should be depicted as an cation+anion pair. (I note that some ionic solids may exist in the gaseous state as a (covalent) pair or commonly multiple pairs.) The problem is that the *formal* structure isn't usually an accurate portrayal of the actual structure. Ionic solids exist as anions surrounded by cations and cations surrounded by anions (as a first approximation). That is, they exist as crystals structures or lattices of ions. I don't understand why the infobox contains anything other than Mg(-2) CO3(-2) since that is, indeed, its formal formula. (no structure, no juxtaposition). Again, the Mg ion isn't bare (it is surrounded by MORE than one (equivalent) carbonate ion nor is the Carbonate ion associated with a single cation. This *could* be displayed, but it's not clear to me that such a display would be useful. I'll finally note that the crystal structure is claimed to be "trigonal", and while I have not checked that, I do know that there are 5 point groups and 25 space groups that are "trigonal". That is: the crystal structure is greatly underspecified. 174.130.71.156 ( talk) 23:01, 28 October 2022 (UTC)
Carbonate coordination | Magnesium coordination | Unit cell | Packing |
---|---|---|---|