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Showing Enantiomorphous Crystals of Tartaric Acid

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Julio Andrade-Gamboa

Área de Química, Centro Regional Universitario Bariloche, Universidad Nacional del Comahue and Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Río Negro, Argentina

J. Chem. Educ., 2007, 84 (11), p 1783

DOI: 10.1021/ed084p1783

Publication Date (Web): November 1, 2007

Section:

History, Education, and Documentation

Abstract

Most of the articles and textbooks that show drawings of enantiomorphous crystals use an inadequate view to appreciate the fact that they are non-superimposable mirror images of one another. If a graphical presentation of crystal chirality is not evident, the main attribute of crystal enantiomorphism can not be recognized by students. The classic case of tartaric acid crystals is discussed and the use of an alternative graphical representation and a paper model is proposed to facilitate the conceptualization of this subject.

Keywords (Audience):

Graduate Education / Research

Keywords (Domain):

Organic Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Chirality / Optical Activity

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History

Received: August 03, 2009

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Showing Enantiomorphous Crystals of Tartaric Acid