Posted by **Jenn** on Saturday, November 15, 2008 at 11:23pm.

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.

- organic chemistry -
**DrBob222**, Saturday, November 15, 2008 at 11:42pm
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.

- organic chemistry -
**Bob Costas**, Wednesday, February 24, 2010 at 7:57am
Once again, thank you Dr. Bob!

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