Talk:Raoult's law

message: Can someone provide information on how activity coefficients demonstrate either positive or negative deviations from Raoult's Law? 171.64.133.56 22:53, 24 February 2006 (UTC)
replies: text: I have no sources but intuitively I would expect a partial cancellation. If for example A-B has positive deviations and A-C has negative deviations, then a molecule of A is attracted more weakly to B molecules than to other A molecules, and more strongly to C molecules than to other A molecules. So in a ternary mixture the average forces on an A molecule should be intermediate between those in A-B mixtures (with the same amount of B as in the ternary mixture) and A-C mixtures. And therefore the vapour pressure should also be intermediate. However I think we need some sources to check my reasoning before actually inserting this in the article - try either advanced textbooks or a Google search. Dirac66 (talk) 19:08, 15 July 2013 (UTC)
replies: text: Of course some sources must be checked before insertion in article. What advanced sources come in your mind? Useful in this context would be a browsing of ternary azeotropes databases, if there are some.--188.26.22.131 (talk) 09:59, 17 July 2013 (UTC)
replies: text: As I said, I unfortunately have no sources. If you can find useful information in azeotrope databases, that might be helpful. Dirac66 (talk) 01:52, 18 July 2013 (UTC)
thread_title: Deviations from Raoult's Law

message: Hi! I've noticed your background and edits on the topics concerning thermodinamics. In this context I request some feedback from you regarding the deviation from the ideal Raoult's law in ternary mixtures in order to fill in the article in this respect. 
The article mentions positive and negative deviation in binary sistems. What could happen if a positive deviation binary mixture is mixed with a negative one? Could (it be that) they cancel out their deviation from ideality and the resulting mixture be an ideal one? Do you know some sources regarding this aspect?--188.26.22.131 (talk) 08:39, 15 July 2013 (UTC)
replies: text: I have no sources but intuitively I would expect a partial cancellation. If for example A-B has positive deviations and A-C has negative deviations, then a molecule of A is attracted more weakly to B molecules than to other A molecules, and more strongly to C molecules than to other A molecules. So in a ternary mixture the average forces on an A molecule should be intermediate between those in A-B mixtures (with the same amount of B as in the ternary mixture) and A-C mixtures. And therefore the vapour pressure should also be intermediate. However I think we need some sources to check my reasoning before actually inserting this in the article - try either advanced textbooks or a Google search. Dirac66 (talk) 19:08, 15 July 2013 (UTC)
replies: text: Of course some sources must be checked before insertion in article. What advanced sources come in your mind? Useful in this context would be a browsing of ternary azeotropes databases, if there are some.--188.26.22.131 (talk) 09:59, 17 July 2013 (UTC)
replies: text: As I said, I unfortunately have no sources. If you can find useful information in azeotrope databases, that might be helpful. Dirac66 (talk) 01:52, 18 July 2013 (UTC)
thread_title:  Ternary systems vapour pressures deviation 

message: This article needs a lead paragraph that introduces the subject, any practical "real world" applications and does so in layman's terms before launching into the technical explanation. Anyone want to try? --Monotonehell 04:11, 17 March 2007 (UTC)
thread_title:  Lead paragraph 

message: What is the proof of the law that vapour pressure of a component of a solution is V.P. of its pure form multiplied by its mole fraction in the solution?  —Preceding unsigned comment added by 121.247.78.162 (talk) 05:29, 11 October 2009 (UTC)
thread_title:  proof of roult's law 

message: Should there not be a green curve, as in the negative deviation diagram but, bulging upwards that sums up the individual vapor pressures?
LoneSeeker (talk) 16:12, 30 December 2009 (UTC)
thread_title:  Positive deviation diagram is incorrect??? 

message: All three diagrams (ideal and non-ideal) assume that the vapour pressures of the two pure components are equal: pA* = pB*, so that the total vapour pressure is independent of the mole fraction and is represented as a horizontal line. However this is only a special case - in general this assumption is not true and the total vapour pressure line should have a non-zero slope. More general diagrams can be found in most general chemistry and physical chemistry texts. Dirac66 (talk) 17:42, 9 November 2010 (UTC)
replies: text: Done. I have now replaced these diagrams with new diagrams for which the Raoult's law total vapor pressure has a non-zero slope. The new diagrams are copied from the Italian Wikipedia and I have re-captioned them in English. Dirac66 (talk) 01:07, 27 May 2012 (UTC)
thread_title:  Diagrams should be more general 

message: The statement for electrolytes should be added.--82.137.12.0 (talk) 23:32, 9 August 2012 (UTC)
thread_title:  Electrolytes 

message: Is there any reason why the opening statements in the lead don't contain any math? Much of what is said would be more clearly and efficiently stated using the equation Pi=(xi)(Pi*) (albeit with proper typesetting). JCMPC (talk) 17:53, 16 November 2013 (UTC)
replies: text: Yes, I agree. The version of 15 August 2013 was better I think, with what appears to be the historical statement (by Raoult translated into English?) followed immediately by the equations. It is true that much of the verbal explanation added to the first paragraph since then essentially duplicate the equations which follow. Perhaps you could trim the lead as you have suggested. Dirac66 (talk) 03:02, 20 November 2013 (UTC)
replies: text:  Sounds good. It might be a while before I have something that is intelligible, but I'll work on it. JCMPC (talk) 15:54, 21 November 2013 (UTC)
thread_title:  Opening statements in lead 

message: Can this law be combined with Antoine equation?--5.2.200.163 (talk) 17:36, 24 March 2016 (UTC)
thread_title:  Antoine equation