organic chemistry
posted by Jenn .
An optical rotation study gives a result of +140 degrees. Suggest a dilution experiment to test whether the result is indeed +140 degrees, not 220 degrees.

Dilute by a factor of 10. Rotation will be +14 if it is 140 or 22 if it is 220. The direction you turn the polarimeter control will tell you which. Check my thinking.

Once again, thank you Dr. Bob!
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