Specific Rotation (How do i calculate this?)?
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(b) The formula to calculate the specific rotation of an optically active compound from the measured rotation of its solution is: where a is measured rotation, l is pathlength in decimeters and c is concentration in g/mL Calculate the specific rotation, [a]D, of valine from the following information: [valine] = 0.497 g dissolved in 5 ml of ethanol pathlength = 2 decimeter measured rotation = 6.58o You must include its sign (+ or -). [a]D of valine =
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Answer:
Specific Rotation = Observed Rotation / (conc,g/ml) (length of sample tube, decimeters) 0.497g / 5 mL = 0.0994 g/mL +6.58 / (0.0994 g/mL * 2 dm) = +33.1
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