Talk:Concentration

message: My first effort at wikipedia, the last paragraph still needs work I think. Let me know what you think.
Aglimme
Sorry, my english is too bad to correct the article, however I signal that molarity and normality are different and distinct concepts. Svante 23:48, 3 Jul 2004 (UTC)
thread_title: Authoring

message: I suggest this section needs to be revised and expanded with examples. I don't have sufficient chemistry knowledge to do a good job, but maybe someone else can? -- FirstPrinciples 08:27, Oct 8, 2004 (UTC)
Please check 195.229.241.180's edit. — Jeandré 2005-06-28t10:54z
I've updated the normality section, its referencing disambiguation page, and the equation at the bottom, to reflect the standard chemical definition of normality, which is concerned with the gram equivalents in solution. I thought the old version of the equation was a bit misleading -- "valence" may or may not refer to the charge of the ion or the number of bonds connected to the atoms, but we're talking about gram equivalents here, which can include equivalents of electrons - a concept outside the realms of "valence". Hope that makes it clear. Unfortunatley the definition of gram equivalent is somewhat ambiguous in the chemical community, but so it goes.--Lineweaver 23:21, 2 June 2006 (UTC)
replies: text: Fixed (unless I'm missing something here), used formula from table below. Vsmith (talk) 23:55, 19 September 2009 (UTC)
thread_title: Normality

message: Do these concepts also belong under 'concentration'? -- FirstPrinciples 03:51, Oct 12, 2004 (UTC)
Not really familiar with them (actually never heard of tonicity until I just looked it up), so don't know if we want to include them ??
How about activity, fugacity, and partial pressure? -Vsmith 17:11, 12 Oct 2004 (UTC)
thread_title:  Osmolarity, tonicity 

message: The article is almost totally focused on concentrations in liquid systems.  It needs to also cover concentrations in gaseous systems ... for example, pollutant concentrations in the ambient atmospheric air, which are commonly expressed as mg/m³, ppm by volume, etc.
mbeychok 20:58, 3 March 2006 (UTC)
thread_title: How about gaseous concentrations?

message: Could anyone explain to me why a 0.1M iodine solution sold for volumetric analysis is sometimes quoted as 0.1M (0.1N) and sometimes as 0.1M (0.05N)? What is actually in this solution? Thanks! OAP boba 08:20, 27 April 2006 (UTC)
thread_title:  Question about volumetric iodine solution 

message: : It is the ratio of the amount of the substance of interest to the amount of that substance plus the amount of the substance it is in. e.g. 10 parts per million (ppm) sugar in water means that there are 10 mg of sugar in 999,990 mg of water.
If I'm not mistaken, mg are a unit of mass, not amount, so ppm is a ratio of the mass of the solute to the mass of the solvent. Might be a bit pedantic but I'd rather the article was correct than not. Hairy Dude 17:49, 31 May 2006 (UTC)
thread_title:  Parts per million etc. 

message: molarity- moles of solute per liter of solvent
:No, it's moles of solute per liter of solution (solute and solvent together). Shalom (Hello • Peace) 01:30, 4 November 2007 (UTC)
thread_title:  molarity 

message: need to add volumes e.g. used in measuring hydrogen peroxide 129.31.72.52 15:22, 11 June 2007 (UTC)
thread_title: volumes

message: The last sentence of the lead section says:
:"Analytical concentration includes all the forms of that substance in the solution."
I know what that means, but it's not immediately obvious, nor is it referenced at that point.  I'm not sure if it's discussed later.  I think a clearer explanation of this point would help readers. Shalom (Hello • Peace) 01:30, 4 November 2007 (UTC)
thread_title:  Explain this! 

message: Part of the reason I never became a chemist is they explain things so darn poorly. What the heck does the following mean?
Normality highlights the chemical nature of salts: in solution, salts dissociate into distinct reactive species (ions such as H+, Fe3+, or Cl-). Normality accounts for any discrepancy between the concentrations of the various ionic species in a solution. For example, in a salt such as MgCl2, there are two moles of Cl- for every mole of Mg2+, so the concentration of Cl- as well as of Mg2+ is said to be 2 N (read: "two normal"). Further examples are given below.--Filll (talk) 01:30, 5 March 2008 (UTC)
thread_title: Written awfully

message: they should be combined.  —Preceding unsigned comment added by 72.65.167.164 (talk) 23:32, 12 May 2008 (UTC)
thread_title:  why are there two molarity sections? 

message: The "Normality" section has four subsections (definition, uses, specific cases, practical uses).  It is the only term in this list of terms that have subsections.  These subsections should either be rolled into a "Normality" page, combined with the first paragraph, or at the very least be annotated as sub-sections.  —Preceding unsigned comment added by 141.116.57.142 (talk) 14:35, 17 June 2008 (UTC)
thread_title: Subsections

message: "i do not know what 's meant by mass volume ratio"
I have removed the "Mass-volume ratio" from the main article until someone can actually provide some details. The above message is the only content in that section. --Freiddie (talk) 00:16, 6 November 2008 (UTC)
thread_title:  Mass-volume ratio 

message: The Percentage solution page duplicates some of the information on this page. As Percentage solution is a measure of concentration, I think that page should redirect to the appropriate place on this page. Grayob (talk) 17:03, 2 June 2009 (UTC)
replies: text: The information in the Percentage solution page belongs in a number of different sections of the Concentration page, not just in the Mass percentage (fraction) section. --Ben Best (talk) 06:15, 7 November 2009 (UTC)
thread_title: Percentage Solution

message: According to IUPAC (see http://goldbook.iupac.org/C01222.html), concentration is always defined as something "per volume". Thus, mass fraction, mole fraction, and molality are NOT concentrations! If at all, they should only be mentioned here under the header "incorrect usage". RolfSander (talk) 23:03, 4 March 2011 (UTC)
thread_title:  Definition of Concentration 

message: It's fine to have the new redirection from "Chemical concentration" to this page. However, I don't think the hatnote "Chemical concentration redirects here" is useful. It only provides a link to the page where you are already. Besides, there is already the "other uses" hatnote.--RolfSander (talk) 09:19, 26 April 2012 (UTC)
thread_title:  New hatnote 

message: Dependence starting from the referemce value:
:\rho_i = \frac {{\rho_{i,{T_{ref}}}}} for mass concentration
--MagnInd (talk) 23:20, 20 June 2012 (UTC)
replies: text: c_i = \frac  for molar concentration--MagnInd (talk) 23:30, 20 June 2012 (UTC)
thread_title:  Dependence on volume 

message: See the subject.  Refer to the page on Systeme Internationale to see that there, "SI units" is used, not "SI-units".  — Preceding unsigned comment added by 71.231.77.227 (talk) 01:57, 25 October 2012 (UTC)
thread_title:  "SI-units" is not correct, please include a section on Formality. 

message: Ditto the comment from 2006 above, what about gaseous concentration? I am having a difficult time doing calculations on gas mixtures because they are very commonly identified by per cent of each component with no further clarification of whether it is percent by moles, by volume or by weight. Betweendust (talk) 04:00, 25 November 2013 (UTC)
thread_title:  Gaseous Concentration 

message: It’s mean the act of doing sjnegihg 2601:406:5000:1806:CDE5:9FD7:C999:93DE (talk) 21:34, 28 November 2021 (UTC)
thread_title:  What does concitertation means