P3 S2 Pre-Lab Worksheet

P3 S2 Pre-Lab Worksheet - Chemical Thinking P3S2 Pre-Lab...

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Chemical Thinking P3S2 Pre-Lab Worksheet v1.1 | Project 3 Session 2 Pre-Lab Worksheet GRADE ____ /10 p Evaluating Proposals Presented below are four preliminary student proposals (numbered 1 through 4) to quantitatively characterize and finely control the light emitted from glow stick chemistry with the objective of identifying one or more trends. Proposal 1 Activate a green glow stick. Open and transfer activated solution into a 1 dram (3.7 mL) vial. Add 5 mL of 0.1 M sodium salicylate in ethanol at room temperature (20 o C) by transfer pipette. Mix well. Now measure the intensity by emission spectrometer. Next, change the temperature to 40 o C. Measure the intensity. Continue in 20 o C increments until 100 o C. Plot intensity vs. temperature (in o C). Look for trends. Proposal 2 Activate a green glow stick. Label two 1 dram (3.7 mL) vials “A” and “B.” Open glow stick and transfer 3.00 mL of activated solution into vial “A” and another 3.00 mL into vial “B” over a spill containment bin. Cap both and record the emission spectrum via emission spectrometer of both to confirm equivalent output, establish a baseline and determine λ max . To vial “A” introduce every 30 seconds 20 µL of 0.1 M KOH by 20-200 µL micropipette set at 20 µL. Immediately recap and mix by four gentle
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