2. 0.5 g of optically-enriched (-)-mandelic acid was dissolved in 10 mL of absolute ethanol. Using a 1 dm polarimeter tube, the observed optical rotation was found to be -6.8°. What is the specific rotation?

2. 0.5 g of optically-enriched (-)-mandelic acid was dissolved in 10 mL of absolute ethanol. Using a 1 dm polarimeter tube, the observed optical rotation was found to be -6.8°. What is the specific rotation?

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter3: Stereoisomerism And Chirality

Section3.7: Optical Activity—how Chirality Is Detected In The Laboratory

Problem 3.9P

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NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.

Question

Can I get help with number 2

Dr. VMV weighed out 1.02 g of menthol and dissolved it into 10.0 mL of absolute
ethanol in a 10.0 mL volumetric flask. The optical rotation for this solution was
obtained in a cell with a 50 mm optical path length, found to be -2.508°, using the Na
D-line at 25.1 °C. What is the specific rotation?
2. 0.5 g of optically-enriched (-)-mandelic acid was dissolved in 10 mL of absolute
ethanol. Using a 1 dm polarimeter tube, the observed optical rotation was found to
be -6.8°. What is the specific rotation?
3. Pure (-)-mandelic acid has a specific rotation of -160° (same conditions and
temperature as sample above). What is the % optical purity of the sample above?

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