01:160:311 Study Guide - Quiz Guide: Elution, United States Academic Decathlon, Ethyl Acetate
29 May 2019
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Information for super quiz 2: 7 questions (some of them multi part) 2 questions on tlc, 2 on extraction and 2 on esterification and 1 on aldol condensation. Tlc: visualizing, use uv light for conjugated compounds, use iodine vapor for most other compounds, why pencil needed to mark and why ink is never used, pencil is used because it is inert. 10mm from bottom is the spotting line with 3 evenly spaced spots for samples. Lightly touch the tlc plate with the capillary to spot. In developing chamber, ethyl acetate must be 4mm high (level has to be below spotting line). *note: methanol and ethanol are not good extraction solvents because they are miscible with water. Impact on purity and percent recovery since you did not carry it out and procedure for carrying out: backwashing: washing test tube contents with ether in order to remove any organic material that might contaminate tube contents.
