14. Answer the following problems with explanation. The specific rotation [a of

Question

14. Answer the following problems with explanation. The specific rotation [a of natural epinephrine (adrenaline) in water is-50°. Assume that all measurements are made in 10 cm polarimeter sample container at 25°C (a) What is the optical rotation of a 10 mL water solution containing 2.0 g of natural epinephrine? (b) To determine the optical purity of a synthetic epinephrine, you prepare a 10 mL water solution containing 1.0 g of the synthetic product, measure the optical rotation, and get a reading of-40°. What is the optical purity of the synthetic adrenaline. (c) What are the percentages of the major and the minor enantiomers in the synthetic

Explanation / Answer

14.(a) Concentration of epinephrine (c) = 2/10 = 0.2 g/ml

Path length (l) = 10 cm = 1 dm

Specific rotation of epinephrine ( [?] ) = -50°

We know that,

[?] = ?o/{c*l}

Where, ?o = observed optical rotation

?o = [?] *c*l

   ?o = (-50° )*0.2*1

?o = -10°

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