Talk:Enthalpy change of solution: Difference between revisions

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Positive vs. Negative

Am I correct in thinking that a compound with a positive heat of solution will produce a cooling effect when it is dissolved in water, and vice-versa? This article seems to support that (eg. ammonium nitrate has a substantial cooling effect; it has a positive enthalpy of solution), but if this is true, then several articles (erythritol, isomalt, and probably others) and a patent (http://www.freepatentsonline.com/20050196517.html) contain glaring errors. --Pyrochem 03:09, 11 September 2007 (UTC)[reply]

You are correct. The articles on erythritol and isomalt are also correct. I haven't had time to read through the patent though. Iggwilv (talk) 03:25, 15 April 2010 (UTC)[reply]

Sodium Chloride

Hi, sodium chloride dissolved in water, has +3.89 kJ not kcal per mol, I'll change tat (data source, google, wiki german, and so on) —Preceding unsigned comment added by 77.239.33.181 (talk) 21:47, 14 January 2009 (UTC)[reply]

Sodium Hydroxide

what is value for sodium hydroxide? —Preceding unsigned comment added by 153.47.0.76 (talk) 10:22, 10 March 2009 (UTC)[reply]

I've added the value for NaOH. It's -44.51 kJ/mol in water at 25°C. --Iggwilv (talk) 17:06, 15 April 2010 (UTC)[reply]

SI units

Since this is a scientific page and scientists havnt used calories for year the given values should really be in kJ/Mol, I wont take the desision upon myself but I deffinetly support the change —Preceding unsigned comment added by 203.221.197.173 (talk) 08:28, 25 March 2009 (UTC)[reply]

The SI unit is kJ/mol. Small letter is used for m.129.94.222.43 (talk) 05:37, 26 March 2010 (UTC)[reply]

I'm going ahead and making these changes since nobody has objected. User:Iggwilv (talk) 02:58, 15 April 2010 (UTC)[reply]

@@ Line 7: / Line 7: @@
 You are correct.  The articles on [[erythritol]] and [[isomalt]] are also correct.  I haven't had time to read through the patent though. [[User:Iggwilv|Iggwilv]] ([[User talk:Iggwilv|talk]]) 03:25, 15 April 2010 (UTC)
+== Sodium Chloride ==
 Hi, sodium chloride dissolved in water, has +3.89 kJ not kcal per mol, I'll change tat (data source, google, wiki german, and so on)  <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/77.239.33.181|77.239.33.181]] ([[User talk:77.239.33.181|talk]]) 21:47, 14 January 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
+== Sodium Hydroxide ==
 what is value for sodium hydroxide?  <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/153.47.0.76|153.47.0.76]] ([[User talk:153.47.0.76|talk]]) 10:22, 10 March 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
+I've added the value for NaOH.  It's -44.51 kJ/mol in water at 25°C. --[[User:Iggwilv|Iggwilv]] ([[User talk:Iggwilv|talk]]) 17:06, 15 April 2010 (UTC)
 == SI units==