(a) An aqueous solution of pure stereoisomer X of concentration 0.10 g mL-1 had an observed rotation...

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(a) An aqueous solution of pure stereoisomer X of concentration 0.10 g mL-1 had an observed rotation of -300 in a 1.0-dm tube at 589.6 nm (the sodium D line) and 25oC. What do you calculate its [a]D to be at this temperature?
(b) Under identical conditions but with concentration 0.050 g mL-1, a solution of X had an observed rotation of +165o. Rationalize how this could be and recalculate [a]D for stereoisomer X.
(c) If the optical rotation of a substance studied at only one concentration is zero, can it definitely be concluded to be achiral? Racemic?
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Organic Chemistry

ISBN: 978-1118133576

11th edition

Authors: Graham Solomons, Craig Fryhle, Scott Snyder

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