Lab_5_-_distillation[1][1] - Lab#5 Distillation S10 CHEM...

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Lab #5: Distillation S10 – CHEM 2203 Emily Giroux: 100-688-773 TA: Jamie Davey Results Table 1. The unknown sample #35 temperature of distilled 5ml fractions initially condensed at 64.0-65.5˚C for the first collected fraction (#1), and from 74.0-75.1˚C for the final fraction (#6) collected. Fractions 2 through 6 condensed at 65.5-67.0, 67.0-68.1, 69.1-72.5, 73.0-73.9, and 74.0-75.1˚C, respectively. This increase was gradual. The initial fraction (#1) and final distilled fraction (#6) produced a refraction indices of 1.3324 and 1.3572, respectively. All fractions displayed miscibility with water. Addition of ceric ammonium nitrate to fractions distilled from fractions 1-6 produced gradual intensification of solution from yellow-orange to orange red, while the control of ceric ammonium nitrate with water produced a light yellow colouration. Discussion The unknown sample #35 obtained is best predicted to be composed of methanol and ethanol. This was concluded through the analysis of the sample’s initial and final fractions collected, at 5ml increments across a 30ml aliquot, by comparison of the temperature of condensed liquid boiling points, refraction indices, solubility in water, and sample colour change upon the addition of ceric ammonium nitrate to test for the presence of alcohol. The temperature increase for the boiling points of the distilled fractions collected throughout the distillation process was gradual, commencing between 64.0-65.5˚C and ending at 74.0-75.1˚C. This indicates that the unknown sample liquid composition was non-azeotropic, which permits for the possible methanol-ethanol as the unknown sample composition as these two compound do not form azeotropes. The initial boiling point observed, 64.0-65.5˚C, most closely resembled the boiling point of methanol, 64.7˚C, and the final distilled product boiling point, 74.0-75.1˚C, most closely resembled the boiling point of ethanol, 78.5˚C. The refraction indice of the initial fraction was 1.3324, closest to the refraction indice of methanol, 1.33, and the final distilled fraction refraction indice, 1.3572, most closely resembled the refraction indice of ethanol, 1.36. All fractions appeared to display miscibility with water. The addition of ceric ammonium nitrate discoloured all sample fractions, displaying gradual colour intensification from yellow-orange to orange red. This gradual change in colour intensity should suggest the increasing presence of alcohol in the condensates, from a weaker presence of alcohol in the initial fractions, and a strong identification of alcohol in the final fraction. As a control, water was used (produced a light yellow liquid colour) to compare the fractions to a non-alcohol compound. While this test suggests the presence of alcohol across all samples, the prediction of methanol as the compound collected with the lowest boiling point,
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This note was uploaded on 05/20/2010 for the course CHEM chem 2203 taught by Professor Someone during the Summer '08 term at Carleton CA.

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Lab_5_-_distillation[1][1] - Lab#5 Distillation S10 CHEM...

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