GRADE/10 p Evaluating Proposals Presented below are four preliminary student pro
ID: 1007354 • Letter: G
Question
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 C) by transfer pipette. Mix well. Now measure the intensity by emission spectrometer. Next, change the temperature to 40 ‰Measure the intensity. Continue in 20°C increments until 100 oGPlot intensity vs. temperature (in 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 max. To vial “A" introduce every 30 seconds 20 of 0.1 M KOH by 20-200 L micropipette set at 20 · Immediately recap and mix by four gentle inversions, then record the emission spectrum. Repeat cycle for a total of 10 minutes. At 10 minutes record the emission spectrum for vial "B." Pipette 20 of 0.1 M KOH into vial "B", mix and immediately record the emission spectrum. Use the results from vial "B" to confirm that the activated solution light output remains reasonably constant over 10 minutes (or if it deviates, by how much) and when challenged at 10 minutes with 20 ul of 0.1 M KOH the system at 10 minutes responds as it did at 30 seconds with vial “A" (and if it doesn't, by how much). Plot the intensity at the Amax versus volume of 0.1 M KOH. Analyze for trends Proposal 3 Use three red glow sticks. Combine activated red glow stick solution into vial. Distribute 3 mL of this activated red solution into six separate 2 dram (7.4 mL) vials. Treat vials according to the following schedule: Temperature (by ice bath or hot water bath) 60 0 ° 60 VialAcid (0.01 M HCLin ethanol) 1 d rop 5 drops 10 dronsExplanation / Answer
QUESTION ONE
Given below are the quantitative proposals.
Proposal 2
Proposal 4
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