Talk:Solubility

message: I have removed the merge notice for solution and solvent and have modified the merge notice for soluble to reflect the consensus. Ancheta Wis 15:05, 3 September 2005 (UTC)
thread_title:  Merge notice dispute 

message: Hi, I know that there should not be Hg22+ in this article, but what I don't know is whether it should be + or 2+, or if it matters. I thought I'd put up one of those annoying dispute notices and let someone else more knowledgable fix it... Thanks! -postglock 14:19, 27 November 2005 (UTC)
replies: text: No, that's correct, at least according to what I've been taught in school. I'd offer a quote if I could find it in my damn textbook, but no luck. I took the liberty of removing the notice--hopefully it won't offend. EvilStorm 18:12, 8 December 2005 (UTC)
thread_title:  Accuracy disputed tag added 

message: I have improved the Soluble article to discuss solubility.  That article also contains links to solute, solvent, and solution.  H Padleckas 22:34, 6 Apr 2005 (UTC)
thread_title:  Improvements 

message: From the chart in the article, one could argue that NaCl (Common Table Salt) would be more soluble than Sucrose (Table Sugar) because of the fact that NaCl is ionically bonded and above the polar covalent bonds found in sucrose. However, many people seem to believe that the solubility of sucrose is greater than that of Sodium Chloride. Who is right? Is Sucrose more soluble, or is Sodium Chloride? 24.11.91.3 15:33, 3 April 2006 (UTC)
replies: text: I don't think that the chart is necessarily meant to imply that ionic compounds are always more soluble than polar covalent compounds, especially becasue the "metallic" bonding type is listed above polar covalent; most polar covalently bonded compounds are more soluble than metals. Natsirtguy 19:54, 4 October 2006 (UTC)
thread_title: What is the MOST soluble substance?

message: why the solubility increase when the temperature increase
:Sometimes it does; sometimes it doesn't. --Smack (talk) 19:28, 29 December 2006 (UTC)
replies: text: Semi-hand-waving explanation here: At higher temperature, molecular mixtures tend to become more disordered (increasing T increases the importance of entropy term in the Gibbs free energy equation). The solvation you mention (water molecules forming hydrogen bonds or polar interactions with solvated molecules) is a form or order (those solvent molecules are specifically organized around specific solute positions). So at high temperature, it might be advantageous to disrupt that ordering, moving towards greater entropy. Less solvation->less solubility? The Real Truth is that it's all a balancing act: better to have ordered solid (not-dissolved/crystal) and disordered solvent, or have some solvent ordered around solvated stuff (dissolved)? The real answer obviously depends on the exact nature of a given solvent and solute, because the exact energetics of the solid and solvated forms. That graph in the Solubility#Factors affecting solubility section is kinda neat! DMacks (talk) 06:34, 27 June 2010 (UTC)
thread_title:  Solubility 

message: I'm not sure, but couldn't solubility also be considered a physical property? -tcwd 23:23, 1 October 2006 (UTC)
replies: text: What are you refering to? Why is this relevant? JKW 21:42, 2 October 2006 (UTC)

text: I think he's talking about the categories down the bottom, and feels that it should be added to the physical properties category also. Aquain (Non member) 06:05, 25 November 2006 (UTC)

text: He does have a point. Solubility is how much solute can dissolve in a solvent. Dissolvation is a physical property, so why not solubility? 17:08, 9 December 2006 (UTC)
thread_title:  Physical or chemical property? 

message: okay, this page needs to be edited for sure, someone wrote " a solution at equilibrium that can kiss my butt"
^^^
LOL
well..its changed for a while now...right?[BR]
Well...are we gonna amerge Solid Solubility to this article?
I'm not sure we should...we should just have a link to link to that article
Invader05 00:34, 29 December 2006 (UTC)
replies: text: I'm not sure either.  Does the term "solubility" usually include solid solutions? --Smack (talk) 19:28, 29 December 2006 (UTC)

text: The situation of gases could be explained similarly using the words already written. It's just a matter of examples. --Deryck C. 06:47, 27 January 2007 (UTC)
thread_title:  Merge 

message: Moved from Wikipedia_talk:Chemistry_Collaboration_of_the_Month
I tried to wade in to improve this article as the CCotM. It's quite a staggering task to perfect this article. I'd like to talk about it here before I do any damage, though. IMHO, a lot of the information simply doesn't belong in this article. Rather, they should be in the relevant related articles, such as solution, solvent, etc. Solubility should not attempt to encompass everything to do with this. Perhaps it should limit itself to 
# Definition (do we refer to the property of simply being able to dissolve, or the stricter definition (IUPAC) of the maximum amount of stuff which will dissolve?)
# What determines a substance's solubility (briefly, main article being solution), including a passing mention of factors such as temperature and/or pressure (for the case of gases)
# Applications of solubility in chemical processes, and everyday life e.g. making milk from powdered milk
Comments please! --Rifleman 82 16:52, 2 January 2007 (UTC)
replies: text: Yes, it's a challenging article, but a very important one.  I think we need to address all of the above, and more.  IMHO, we should address both definitions of the term, as given here.  By the way, you might be interested to know the history of this page - it used to be called Soluble and was only changed a year ago.  I suspect a lot remains to be cleaned up from that, though solubility is a much better title IMHO.  I'd also like to reiterate my comments on the main page - we need to consider the related articles solvent and solution - that means not duplicating (or triplicating) a lot of information.  As for other topics, I'd like to see a discussion of factors that make something soluble (or not), such as polarity and lattice energy. Should we move this discussion to Talk:Solubility to bring in a broader set of opinions? Walkerma 06:37, 3 January 2007 (UTC)
replies: text: I did a rewrite of much of the text, and added a more general chart showing solubility curves for a variety of salts - not just Na2SO4.  I had trouble getting Excel to draw these curves, so I had to fill in the gaps with coloured pencil!  Excel also won't let you have subscripts in the chemical formulae (even though my table had them). My poor artistic skills aren't too obvious unless you click on the image or look quite closely, but if anyone has better graphing software than Excel (or knows how to use Excel more effectively?), perhaps you could let me know and we could improve it.  Another thing, I wanted to cover polarity under the "factors affecting solubility" since I thought it relevant, but then I found a section on organic compounds later on that sort-of covered much of the same topic.  I tried to rewrite both to limit any duplication, but I'd appreciate a second pair of eyes on this.  Maybe it's OK, but if not, feel free to consolidate if you think there is too much duplication.  Thanks, Walkerma 07:14, 28 January 2007 (UTC)
replies: text: I managed to find out how to do this, so I cleaned it up. I may try to improve it more later.  Walkerma 02:35, 17 February 2007 (UTC)
thread_title: Chemistry Collaboration of the Month

message: The chart seems to put soluble and insoluble substances side by side. Not being a comparison chart, imo that's not a good presentation. An alternative chart puts the group of substances on either the soluble or insoluble side, and lists the exception on the other side. --Deryck C. 13:49, 17 January 2007 (UTC)
thread_title:  Solubility chart 

message: Added hydroxide entry to table (see reference: Chemistry, Concepts and Problems).  Otherwise the book reflects the same info but author(s) note the table is partial table and for use with the book material.  — Preceding unsigned comment added by 70.177.172.35 (talk) 17:52, 3 June 2012 (UTC)
thread_title:  Solubility chart add 

message: hydroxides and oxides (except Group I, NH4+, Ba2+, Sr2+, Ca2+ and Tl+)
Where CaO will react with water to form CaOH2
Solubility:
0.185g/100 cm³
Ksp = 4.68 × 10−6
That is misleading people that CaOH2 is soluble.
I think we should change that. —The preceding unsigned comment was added by Snoopy11hk (talk • contribs) 09:18, 30 March 2007 (UTC)
thread_title:  Wrong Information 

message: I undid this revision because it added rather extensive information that is essentially identical to that already contained in another section.  The new information was added under section "Quantification of solubility" and it duplicates the content of "Solubility of ionic compounds in water". I apologize to the original contributor who obviously put a lot of work compiling the info independently. Stan J. Klimas 11:37, 23 September 2007 (UTC)
replies: text: Could we probably turn that excess information into another article so as to preserve it? --Deryck C. 21:14, 20 April 2008 (UTC)
thread_title:   2007-09-23T11:21:59 -- Undid revision 159465454 

message: Hi.  Could someone draw a picture for this section.  I think it would be VERY helpful for people to visually see how the different ions are attracted to each other.
I WOULD draw it myself, but I don't have the software to make the chem-pictures.  Anyone know if there's a free version somewhere??  —Preceding unsigned comment added by Armadillo1985 (talk • contribs) 01:50, 31 May 2008 (UTC)
replies: text: Hello. This seem to be more related to the article solvation.  For free (open source) software, I would start with :Category:Free_science_software. XDrawChem is perhaps the easiest to start with. Additional resources at http://www.redbrick.dcu.ie/~noel/linux4chemistry/ Stan J. Klimas (talk) 16:10, 31 May 2008 (UTC)
thread_title: Add Picture to "Solubility of Ionic Compounds" Section

message: *Is there a better title for the Molecular view section? I can't think of one but the title just doesn't seem that encyclopaedic. This section also needs 2-4 refs, preferably one for each separate paragraph. 
*In general, I've tagged sections as opposed to statements with , but ideally each statement should be referenced.
*The term "ith" in the explanation of the Pressure equation is probably not well known to non-science/maths people, and may need an explanation in itself.
*I've removed the comment in the benzoic acid cynthesis: "On a practical note, the benzoic acid obtained after evaporating the organic solvent should ideally be purified by recrystallizing from hot water". Although it's correct it may be a bit confusing- perhaps there's a better (but still simple) example out there?
Cheers Freestyle-69 (talk) 23:02, 26 June 2008 (UTC)
thread_title:  Copyedit 

message: The graphs relating Solubility and temperature are helpful, however they are lacking the temperature scale. (K, C, F)  —Preceding unsigned comment added by 198.188.6.56 (talk) 21:21, 3 November 2009 (UTC)
replies: text: Seems to have been fixed at some point. DMacks (talk) 20:32, 22 July 2017 (UTC)
thread_title:  Graphs need improvement 

message: Are gases most soluble at the top of a glass of water or at the bottom? In other words, is there a higher concentration of gas molecules at the top of an aqueous solution, or is there a higher concentration of gas molecules at the bottom?  —Preceding unsigned comment added by 174.18.19.205 (talk) 17:38, 8 May 2010 (UTC)
thread_title:  Solubility of Gases in water 

message: I actually got to the article via a redirect from slightly soluble - but the article doesn't discuss the various grades of solubility at all. I appreciate that increased traffic looks good for the page, but using a redirect that's mentioned nowhere on the page, and about which no information can be found, comes off very badly. It's akin to finding a search result purportedly about iguana breeding habits when it's actually a porn site ad. 76.22.25.102 (talk) 00:29, 30 May 2010 (UTC)
thread_title:  Redirects 

message: The introductory sentence is:
Solubility is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a liquid solvent to form a homogeneous solution of the solute in the solvent. 
Isn't the phrase homogeneous solution redundant? If it isn't homegeneous doesn't it become a heterogeneous mixture and not a solution?--PedroDaGr8 (talk) 23:37, 2 March 2011 (UTC)
thread_title:  Introductory Sentence redundant?  

message: It's been a long time since frosh chem. I have a sense of how water dissolves polar molecules--the charge polarity of the molecule acts a little like a magnet, grabbing on to an exposed pole on the surface of the to-be-solute and pulls it off. (Let me know if that's off-base.) Then with nonpolar molecules, I can see why water wouldn't want to dissolve them--there'd be a surface energy at the interface because the water molecules like "dissolving" each other. But what about solubility. If I put individual molecules of ABS plastic in benzene, I can imagine that they would be happy together since the "outsides" of both molecules "look" like a bunch of covalently-bonded hydrogens, but how do nonpolar solvents pull their to-be-solutes apart? Obviously there's an energy gradient, but what is lower-energy about a plastic molecule in benzene versus one hanging out with its other plastic-molecule friends? Wouldn't there be an energy hump to get over to untangle the polymers? —Ben FrantzDale (talk) 14:08, 5 October 2011 (UTC)
thread_title:  How do nonpolar solvents "work"? 

message: But it is not insoluable?  A metal (M) and OH (hydroxide) MO will react with water to form a metal hydroxide M[(OH)2].  The metal oxide is a base, the metal hydroxide a new solute (the water is "consumed").  So a reaction does occur , so MO is certainly not "insoluable" but soluable and reacting.
(i see what you meant (when and how), but if it's included every subatomic fact in every label we cannot say anything without everything, making learning chemistry diffucult in deed)
— Preceding unsigned comment added by 70.177.172.35 (talk) 01:54, 4 June 2012 (UTC)
thread_title:  Wrong Information ?? 

message: I corrected the below (unfortunately lengthening it).  Please talk if you think it needs help.  What it should do is say that an application of solubility is equations and titration plus introduce terms, but very briefly, so that this is in mind for the reader who reads sections following Applications.
Solubility and insolubility together indicate whether solubility reactions will take place. This can be read from a correctly written balanced chemical equation (complete ionic notation) by noting whether any products are formed from the soluble reactants. If reactants in solvent form a precipitate, covalent compound, water, a weak electrolyte, a gas or water (aq) then a reaction takes place, otherwise not (they are all spectator ions). An example: if bubbles are seen a gas was produced, a re-bonding reaction occured. [16]
:I removed this paragraph from the article again because it has multiple inaccuracies.  The sentence "Solubility and insolubility together indicate whether solubility reactions will take place" is vague and its meaning is not clear at all.  The second sentence "This can be read from a correctly written balanced chemical equation (complete ionic notation) by noting whether any products are formed from the soluble reactants" doesn't make any sense to me because in any balanced chemical equation there are reaction products.  Also, the phrase "This can be read" is simply ambiguous. It is not true as a general rule that "If reactants in solvent form a precipitate, covalent compound, water, a weak electrolyte, a gas or water (aq) then a reaction takes place" because it there are many exceptions - it ignores activation energy, rates of reaction, and the dependence on factors such as temperature.  The claim that "if bubbles are seen a gas was produced, a re-bonding reaction occured", in additional to being grammatically incorrect, is also not true as a general statement because there can be other reasons for the production of gas such as boiling of the solvent, to name one.  -- Ed (Edgar181) 12:56, 4 June 2012 (UTC)
thread_title:  Correction 

message: It would be wonderful to have someone write a cogent explanation of the standard reporting terms for solubility and the variants that exist in the literature. Thus, one might consider practical preparations (35g sodium chloride added to 100 g water), measured amounts (100 g of a sample is evaporated to produce 3 g sodium chloride, thus is a 3 wt% solution of sodium chlroride). What about PPM - does this constitute the first case or the second??  — Preceding unsigned comment added by 131.167.254.100 (talk) 16:15, 14 November 2012 (UTC)
replies: text: I agree. It would be nice with either g/100 ml or wt% as a standard. In the formaldehyde article the solubility is given in g/dm-3... that is just more confusing to the reader than useful. One could at least write g/l, it's not like we need to glorify the SI-units by entangling our data. OxygenBlue (talk) 09:05, 21 January 2013 (UTC)
replies: text: The terminology is very confusing.   Sometimes,  it seems to be the amount of solute in the amount of solvent before the solute is added to it.   Other times,  it seems to be the amount of solute in a fixed quantity of the final solution.    For example,  the solubility of sodium chloride is claimed to be 359 grams per litre.  Is that 359 grams of sodium chloride into one litre of pure water ?   Or 359 grams of sodium chloride in one litre of the resulting solution ?   But if you go on and read about mixtures of alcohol and water,  it seems to be quite different. Lathamibird (talk) 05:36, 20 February 2016 (UTC)
thread_title:  Terminology 

message: Hello fellow Wikipedians,
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thread_title:  External links modified 

message: I came to this article to find out how solubility is determined empirically, but I'm none the wiser.Ttocserp 16:02, 6 March 2017 (UTC)
thread_title: How solubility is determined

message: The source for a definition of "insoluble" as < 0.1 g per 100 ml - Rogers, Elizabeth; Stovall, Iris (2000). "Fundamentals of Chemistry: Solubility". Department of Chemistry. University of Wisconsin. Retrieved 22 April 2015 - leads to a 403 Forbidden error. Either an equivalent source should be found or the claim should be removed. Gsurfer04 (talk) 13:55, 11 May 2017 (UTC)
thread_title:  Inaccessible source 

message: change ((salt))s to ((Salt (chemistry)|salts)) — Preceding unsigned comment added by 73.154.31.58 (talk • contribs) 12 May 2017 (UTC)
: Done. I did not change the wikilink in the "Solubility of ionic compounds in water" section since salts is a redirect to Salt (chemistry).  —KuyaBriBriTalk 21:24, 12 May 2017 (UTC)
thread_title:  Salt link 

message: I can't believe I didn't find this information in Wikipedia article.
https://www.sigmaaldrich.com/united-kingdom/technical-services/solubility.html
Approx Volume (ml) of Solvent Needed to Dissolve 1g of Solute
* Very Soluble, Less than 1
* Freely Soluble, 1 to 10
* Soluble, 10 to 30
* Sparingly Soluble, 30 to 100
* Slightly Soluble, 100 to 1000
* Very Slightly Soluble, 1000 to 10,000
* Practically Insoluble, Greater than 10,000
ee1518 (talk) 16:09, 18 January 2018 (UTC)
thread_title:  Very Soluble 

message: I wish to add that mass and volume also help to determine the solubility of a substance. The higher the level of solute, different solutions such as unsaturated, saturated, and supersaturated can be formed by utilizing different techniques to achieve this. Treeman183 (talk) 15:30, 27 October 2019 (UTC)
replies: text: Mass & Volume already appear in some places within the article. If you would like to request a specific change, you'll need to be specific: "the request must be of the form "please change X to Y"." - ChrisWar666 (talk) 19:26, 27 October 2019 (UTC)
thread_title:  Semi-protected edit request on 27 October 2019 

message: This article should include info re the solubility of substances in mixed solvents.--109.166.137.83 (talk) 23:30, 19 July 2020 (UTC)
thread_title:  Mixed solvents systems 

message: This seems way too specific to link in "See Also" and there is no explanation as to why it's there. Should we not be linking to more general subjects related to solubility prediction such as Molecular modelling?
Gsurfer04 (talk) 16:35, 25 January 2021 (UTC)
thread_title:  Link to Flexible SPC Water Model?