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Unformatted text preview: Tartaric acid is shown below. Draw all the possible stereoisomers of tartaric acid. Notice that one set of enantiomers are actually identical molecules (the enantiomer of one compound is actually itself). What do you think that means for the optical rotation of that stereoisomer? HO OH O O OH OH HO OH O O OH OH HO OH O O OH OH HO OH O O OH OH enantiomers drawn as enantiomers, but same compound Since the enantiomer of the molecule is itself, the rotation of this isomer is 0 4. If D-tartaric acid has an optical rotation of +12, what is the optical rotation of: a. L-tartaric acid? =12 b. a 50:50 mixture of D- and L-tartaric acid? = 0 c. a 75:25 mixture of D- and L-tartaric acid? = (0.75)(+12) + (0.25)(-12) = 6...
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