ORGANIC CHEMISTRY (II)
LAB DATA & ANALYSIS SHEETS
Reducing Benzil using Sodium Borohydride
Student: _________________________
Date Performed: _______________
Partner: _________________________
Mass of crude benzil (~ 1 g):
_______________
Mass of sodium borohydride (~ 0.2 g):
_______________
Limiting reagent:
_________________________
Theoretical yield (g): _______________
Mass of dry product:
_______________
% yield:
_______________
Physical description of product: ___________________________________________________
Calculations:
Melting Points
Experimental
Dry product
____________
Product / (±)-benzoin
____________
Product / meso-hydrobenzoin
____________
Using your results, explain how the melting point and mixture melting point techniques can be
used to identify your product. Cite literature sources (not the lab manual) for melting points of
pure substances.
Compare the IR spectrum of benzil with that of your product. Point out on the spectra the
similarities and differences which support the identity or your product.
benzil