3. Record the ambient temperature. 4. Determine the corrected refractive index b

Question

3. Record the ambient temperature. 4. Determine the corrected refractive index by placing the observed refractive index into the equation: no20 - nobnerved +0.00045 (t-20) wheret is temperature in °C (pages 32 and 189 Schoffstall) Based on your data for bp, no0 and d, and comparing with the table below, determine which compound is your unknown. For each of your measured physical properties, determine the Percent Error: % error-| theoretical value-experimentalvalel . 100 theoretical value One of your measurements may be off (Le, may have a large % error), while two may match quite closely. Discuss which analytical method may be the most accurate and hence the one you relied mostly on for your unknown determination (see data sheet). y on for your unknown determination (see data sheet) Refractive Density Bolling /ml) Point (C) Index no p. 22 p.31, 191p. 34, 191 Compound 0.6603 0.6637 0.6645 0.695 0.7785 0.785 0.786 0.8035 0.81 0.809 0.8611 69.0 98.4 63.3 89.8 80.7 82.4 81.6 97.4 1.3751 1.3878 1.3765 1.3919 1.4266 1.3776 1.3442 1.3850 1.3993 1.3905 1.4958 Hexane 3-Methylpentane 2,3-Dimethylpentane Cyclohexane 2-Propanol Acetonitrile 1-Propanol 1-Butanol 2-Pentanone p-Xylene Toluene Tetrahydrofuran Ethyl Acetate 103 138.3 0 8669 1106 1.4961 0.8892 0.9003 67.0 77.1 1.4050 1.3723 Checkout and final comments: Place any unused unknown in the organic waste bottle. The empty vial can be set aside on the front bench, NOT put back with the other unknowns meant for future sections. . Be sure to clean the syringe and test tube, rinsing with acetone.

Explanation / Answer

Atmospheric pressure = 760 mm Hg

Miniscale b.p corrected by linear calibration of thermometer = 110.6 degree celcius

Refractive index of unknown liquid = 1.4961

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