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GT CHEM 1310 - Lab Report 10_Phase Diagrams

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States of Matter: Phase DiagramsCatherine Lozier03/19/2013Chem 1310 Section C02TA Ryan BucherLab Partners:Chelsey Arnold Sunya MorinTran GHonor Pledge: I did not copy this work from any others student(s), current students in lab or old lab reports ________________________________________________SignatureDATA AND OBSERVATIONSSolution # mL Hexane mL Water mL Propanol % Propanol λmax aqueous phase (nm)2 1 8 1 10 453.22 1 7 2 20 397.22 1 6 3 30 435.82 1 5 4 40 399.69 1 4 5 50 398.86 1 3 6 60 401.22 1 2 7 70 418.06 1 1 8 80 403.29 1 0.5 8.5 85 417.70 10 20 30 40 50 60 70 80 90360370380390400410420430440450460f(x) = − 0.28x + 427.92R² = 0.15% Propanol v. λ Absorbed% Propanolλ absorbed (nm)DISCUSSIONPart AThe purpose of Part A was to create a ternary phase diagram for a three-component liquid. For the assigned mixtures, group F, only one phase was observed for all test tubes. This was expected, as this group of solutions represented one corner of the phase diagram. The class data showed a distinct separation between the single-phase mixtures and the double-phase mixtures. Any error would likely be due to spilling during mixing or incomplete mixing.Part BThe purpose of Part B was to demonstrate the relationship between propanol content and absorbency. The 10% propanol data showed a slightly negative relationship between the percentage of propanol in the colored phase and the maximum absorbance. The R2 value was 0.1495, which indicates a minimal, if any correlation. Most of the data points had an absorbency of ~410 nm, which would mean that the propanol prefers the non-polar environment of the n-hexane. There are a few data points that are closer to 465 nm, which could be due to groups measuring the wrong liquid phase.DISCUSSION QUESTIONS1. Methyl orange is used to give propanol a distinct absorbency, and thereby help distinguish which liquid phase it resides in.2. Based on the results, the indicator solution is non-polar, as it has an absorbency of ~410 nm. The one-phasesolution is also non-polar, as the methyl orange dispersed evenly throughout the solution.3. Using a high proportion of propanol and relatively low proportions of water and hexane would ensure mixing of the two reactants, and thereby facilitate the reaction.4. The volume of the third liquid would be immense, and might have even more environmental impact than the oil. 5. Test the individual liquids and compare to the results of the mixed liquids.REFERENCES Lab ManualChemistry for Engineering Students, Second Edition. Lawrence S. Brown, Thomas A.


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GT CHEM 1310 - Lab Report 10_Phase Diagrams

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