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Experiment 4.docx - Experiment 4 Organic Qualitative and...

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Experiment # 4 Organic Qualitative and Quantitative Analysis Student Name: Gabriella Selestiyanta Student Number: 1004627914 Lab Partner: Section Number: 132 Date the experiment was performed: March 5 Date the lab report was submitted: March 16 Submitted to George Li Pre-lab Questions Pre-lab Quiz Introduction Experimental Method Results and Calculations Accuracy Discussion Learning Objectives Summary References Experimental Technique Report Presentation Introduction The purpose of this experiment was to determine the function groups that were present in an unknown compound qualitatively as well as calculating the molar mass of the compound. This was done by doing four qualitative tests toward the unknown solution that was put in three test
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tubes in order to determine the presence of three types of functional groups, which were aldehyde using the Tollen’s reagent, ketone using 2,4-dinitrophenylhydrazine [C 6 H 3 (NO 2 )NHNH 2 ], primary and secondary alcohols using Lucas reagent, and esters by indirectly smelling its fragrant. The real solutions that contain aldehyde, ketone, primary and secondary alcohols were also treated with their specific reagents in order to act as a control. Next, observations were done by comparing the result that was obtained with the three control samples, in order to identify the function group that was present in the unknown solution. After determining the type of function group that was present, a quantitative analysis was done in order to calculate the molar mass of the unknown solution, which was done firstly by boiling the unknown solution that was poured in a 125ml Erlenmeyer flask until it reached its gas state. When it reached this state, condensation process was done by running cold water on the surface of the entire Erlenmeyer flask until the flask cooled down. As soon as the flask cooled down, the Erlenmeyer flask together with the condensed unknown solution was weighted in order to identify its mass. The volume of the unknown solution gas was measured by filling the cleaned 125ml Erlenmeyer flask up till its tip and the temperature was measured by putting a thermometer inside the completely filled Erlenmeyer flask. In real life, the identification of functional groups in a compound is basically used in infrared spectroscopy. This is very important in order to determine which athletes used drug doping in order to enhance their performances during Olympics 6 . Experimental Method One modification that happened during this experiment was the usage of cold water to run the surface of the Erlenmeyer flask as a condensation process due to the limited amount of time instead of waiting for 15 minutes to cool it down. The complete method of this experiment can be found in the “CHM120H5S Chemical Principles 2 2018 Course Manual” on page 49-52 4 .
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