Synthesis of Biodiesel Lab Report Form Fill in your section number and names Is this report your group s submission to be graded Select ONE YES NO Sec TA Names Oil Name g g Percent Yield pH of Biodiesel pH of Petroleum Diesel Synthesis Experimental Yield Theoretical Yield Cloud Gel Points Cloud Point of Biodiesel C Gel Point of Biodiesel C Cloud Point of Petroleum Diesel C Gel Point of Petroleum Diesel C Enthalpy of Combustion Trial 1 Trial 2 Trial 3 if needed Initial mass of dish and biodiesel g Final mass of dish and biodiesel g Mass of biodiesel burned g Initial temp of water C Final temp of water C Temp change C Mass of water g Heat flow to water qwater kJ Enthalpy of combustion kJ g Average enthalpy of combustion kJ g Synthesis of Biodiesel Spring 2025 1 What pH values did you measure for your biodiesel and for petroleum diesel If engines are built to use fuel at the pH of petroleum diesel would your biodiesel be suitable for use How might you make it so See if your answer can be informed by an explanation of why your biodiesel sample may not have the same pH as pet diesel 2 The reported literature value for the heat of combustion of most vegetable based biodiesels is about 38 0 kJ g What is your percent error Based on the procedure you used identify at least two possible sources of this error 3 What implications does the cloud point and gel point of your biodiesel have for using 100 biodiesel as an automotive fuel during Wisconsin winters average temperature 11 C to 7 C Synthesis of Biodiesel Spring 2025 Synthesis of Biodiesel Structure Analysis GC MS Composition Analysis Use the gas chromatography GC and mass spectrometry MS data report that corresponds to your assigned type of oil to extract structure information Then use it to describe some of the chemistry behind the experiment Structure Analysis of Your Assigned Oil Type Line structure of the most prevalent fatty acid methyl ester Line structure of the second most prevalent fatty acid methyl ester Line structure of the third most prevalent fatty acid methyl ester Percent abundance Percent abundance Percent abundance Line structure of an example triglyceride from the source oil prior to transesterification reaction Synthesis of Biodiesel Spring 2025 4 Using the structures that together represent a high percentage of your biodiesel sample explain why glycerol formed its own separate layer after being generated during the transesterification reaction why could the glycerol not mix with the biodiesel Your answer should describe all relevant intermolecular interaction types as informed by molecular structure and discuss the relative energetics that would make mixing unfavorable Synthesis of Biodiesel Spring 2025
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