Specific Rotation

[cyberchicken001]

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Why may the specific rotation of a sample of (R)-(+)-limonene be less than the literature value of (R)-(+)-limonene. Assume that there are so (S) enantiomers present, but there are some molecules of methylene chloride mixed into the sample that was analyzed.

 

[Erythropoietin]

Impurity, maybe?

 

[cheesier]

Not answerable + homework question