User talk:RolfSander

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Welcome[edit]

Hello RolfSander, and welcome to Wikipedia! Here are some recommended guidelines to help you get involved. Please feel free to contact me if you need help with anything. Best of luck and happy editing! AmiDaniel (talk) 09:46, 15 May 2006 (UTC)
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Thermodynamik chemischer Vorgänge[edit]

Do you happen to know some details about this classic work like the on line (un)availability? Has it been digitized or not?--MagnInd (talk) 15:35, 26 August 2011 (UTC)

Thanks in advance for any useful info you can find!--MagnInd (talk) 15:42, 26 August 2011 (UTC)

Apparently, you can buy it here:

http://www.amazon.co.uk/Abhandlungen-Zur-Thermodynamik-Herma-Helmholtz/dp/1141513110/ref=sr_1_10?s=books&ie=UTF8&qid=1314373788&sr=1-10

The paper that you mention seems to be a chapter in this book but I'm not sure RolfSander (talk) 15:55, 26 August 2011 (UTC)

Volume concentration/fraction[edit]

It seems a bit surprising that IUPAC documents do not distinguish between the two concepts.--MagnInd (talk) 21:59, 3 September 2011 (UTC)

Indeed, the IUPAC web page is the same for both. To me, only "volume fraction" seems to be well defined. In the absense of a proper definition of "volume concentration" I have to assume that it is exactly the same...--RolfSander (talk) 17:48, 5 September 2011 (UTC)

There seems to be an an inconsistency between volume fraction and volume percent in cases like water-ethanol mixtures.--MagnInd (talk) 21:30, 23 September 2011 (UTC)

It also seems that for non-ideal mixtures like alcoholic ones the volume fraction is easy to calculate but difficult to measure due ton volume non-additivity while volume procent/concentration is easy to measure.(?)--MagnInd (talk) 23:14, 28 January 2012 (UTC)

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Henry′s law[edit]

What data are there concerning Henry′s law constants for gas solubilities in partial miscible multiphasic liquids? And how is the expression of the law in these situations? Is the constant additive? (consisting from contributions give by the solubilities in each of liquids and the partial miscibility domain). (of course taking activities into consideration when necessary).--MagnInd (talk) 17:10, 29 November 2011 (UTC)

I'm sorry but I've only looked at Henry's law for aqueous solutions (I'm an atmospheric chemist: distribution between air and clouds). I cannot help you here--RolfSander (talk) 19:32, 4 December 2011 (UTC)

Is the solubility of gas in aqueous solutions, say oxigen, influenced by presence of electrolytes comparatively to distiled water and how? Is the value of the constant from the law different or activity coefficient comes into play in this case?--MagnInd (talk) 21:12, 6 December 2011 (UTC)

Solubiity of gases decreases with increasing salt concontration of the solution. To see how it is linked to Henry's law, I suggest you google "Sechenov equation" to find out more.--RolfSander (talk) 21:32, 6 December 2011 (UTC)

Thanks for the tip. Perhaps a redirect would be useful Sechenov equation and the article Henry law should be added infos concerning the influence of electrolytes found on google search.--MagnInd (talk) 12:21, 9 December 2011 (UTC)

If you want to add a Sechenov section to the Henry's law page, go ahead! I currently have too many things to do to start with this.--RolfSander (talk) 19:34, 10 December 2011 (UTC)

Happy New Year[edit]

A Happy New Year, with many (wikipedian) achievements, my wikipedian fellow RolfSander!--MagnInd (talk) 20:39, 5 January 2012 (UTC)

Isotopic atmospheric chemistry[edit]

What is the atmospheric importance of deuterium?--MagnInd (talk) 23:59, 12 February 2012 (UTC)

Deuterium (and other isotopes) are mainly used as a diagnostic tool: [1] --RolfSander (talk) 11:17, 13 February 2012 (UTC)

What data are there concerning the atmospheric abundance of deuterated hydroperoxyl?--MagnInd (talk) 21:59, 28 February 2012 (UTC)

Disambiguation link notification for July 13[edit]

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Osmolarity vs osmolar concentration[edit]

Which one of these two names should be in the title of the article?--MagnInd (talk) 18:59, 1 November 2012 (UTC)

Or should it be redirected to molar concentration?--MagnInd (talk) 19:56, 4 November 2012 (UTC)

When there are several names, I always prefer the name that IUPAC recommends: [2], i.e. osmotic concentration. They say it was "formerly called osmolarity". A link to this goldbook page should probably be added to the article as well.--RolfSander (talk) 20:02, 14 November 2012 (UTC)

Raoult's law[edit]

What is the exact statement of Raoult's law for aqueous electrolytes considering van't Hoff factor? It seems that there is a persistent erroneous statement neglecting electrolyte dissociation even in meteorology and atmospheric chemistry sources.--MagnInd (talk) 20:15, 1 November 2012 (UTC)

I'm sorry, I don't know.--RolfSander (talk) 20:02, 14 November 2012 (UTC)

Disambiguation link notification for November 4[edit]

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Eponymous theory[edit]

Do you happen to know who the eponym of Köhler theory might be? Google search is not very useful.--MagnInd (talk) 20:15, 4 November 2012 (UTC)

I also tried to find the origin but so far without success. I will try to ask my colleagues from meteorology, maybe they know (I'm a chemist).--RolfSander (talk) 20:02, 14 November 2012 (UTC)

Persistence of percent concentration[edit]

Regarding the persistence of the name percent concentration, how was mass fraction called when encountered it first time in the elementary textbook? Was it called mass fraction or percent concentration?--MagnInd (talk) 23:28, 11 March 2013 (UTC)

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Indexes[edit]

Hi! Could you give further details on the need to use different indexes in the numerator and denominator of volume fraction?--188.26.22.131 (talk) 10:33, 10 March 2014 (UTC)

Rollback[edit]

Hi, I noticed that you requested rollback right at WP:PERM. That right can only be used when the edit is obvious vandalism. The example you mentioned is not obvious vandalism because the user might be thinking that their edits are helpful to wikipedia. I want to tell you that there are other ways of reverting consecutive edits by same user. You can use Twinkle, it gives non rollbackers the ability to rollback, you can enable it in preferences. Another way is to edit the version, which is in good condition. You can see second method in detail here. Thank you Supdiop talk 10:16, 10 June 2015 (UTC)

Thanks for the hint! It worked, I don't need the rollback right anymore. RolfSander (talk) 11:48, 10 June 2015 (UTC)