Racemic acid and Çiçekdağı, Kırşehir: Difference between pages
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#REDIRECT [[Çiçekdağı, Kırşehir]] |
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'''Racemic acid''' is an old name for an optically inactive or [[racemic]] form of [[tartaric acid]]. It is an equal mixture of two mirror-image isomers ([[enantiomers]]), optically active in opposing directions. |
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Its sodium-ammonium [[salt]] is unusual among racemic mixtures in that during crystallization it can separate out into two kinds of crystals, each composed of one isomer, and whose macroscopic shapes are mirror images of each other. [[Louis Pasteur]] was thus able to separate the two enantiomers by picking apart the crystals. |
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In a modern-time re-enactment of the Pasteur experiment {{Ref|Tobe}} it was established that the preparation of crystals was not very reproducible, the crystals deformed but that the crystals were large enough to inspect with the naked eye (microscope not required). |
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==See also== |
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*[[Tartaric acid]] |
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== References == |
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# {{Note|Tobe}} ''The reexamination of Pasteur’s experiment in Japan'' Yoshito Tobe Mendeleev Communications Electronic Version, Issue 3, 2003 [http://dx.doi.org/10.1070/MC2003v013n03ABEH001803 DOI article] [http://www.mendcomm.org/pages/goodies/mc0303/pdf/mc1803.pdf Free access version with experimental details] |
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[[Category:Carboxylic acids]] |
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[[Category:stereochemistry]] |
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[[fa:اسید راسمیک]] |
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Revision as of 19:14, 12 October 2008
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