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Lab 5 report - CHE 326 Experiment 5 Sodium Borohydride...

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CHE 326 Experiment 5 Sodium Borohydride Reduction POSTLAB 1. Was there a difference between the melting point of your product and that given in the literature? What does this tell you about the purity of the isolated product? The given melting point of meso-hydrobenzoin is 137-139°C and chiral- hydrobenzoin is 146-149°C. They have 2 and 3 °C ranges respectively. The found melting point of the product was 129-133°C. The 4°C range and lower temperature indicate that the product was impure. Impurities in the product, such as water will lower the melting point. A narrower range suggests a more pure product. 2. Calculate your percent yield. Percent Yield = 100 (Actual Mass of Product / Predicted Mass of Product) 62 % = 100 (.314g / .509g) 3. Which peaks in the IR spectra confirm the presence of your product? Which peaks would be present if you had starting material instead? Hydrobenzoin and benzyl will both show different peaks when comparing IR spectra. The product has two broad OH peaks at 3370 indicating the presence of two OH groups. There is also a peak at 2899 for an sp3 hybridized C-H. The starting material will
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