Spectroscopy Post-Lab

Spectroscopy Post-Lab - Q# Question Text 4) Scoring Scheme:...

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Q# Question Text 4) Scoring Scheme: Free Response 1 Pt Why do we allow electronic instruments to warm-up before use? Your Answer: It is recommended/important that one allows electronic instruments to warm-up before using it so that the reading obtained from the instrument are consistent. This allows for more accurate data. Text Answers to be Scored by your TA 5) Scoring Scheme: Free Response 1 Pt Why is it important not to have fingerprints on the cuvette? Your Answer: It's important to not have fingerprints on the cuvette when using a spectrometer because by using a spectrometer one measures the amount of light that the solution in the cuvette absorbs at a certain wavelength. This tells you how much of the solute is dissolved in the solution. However, if you get fingerprints on the cuvette, this could interfere with the light absorption and cause your readings to be incorrect. Text Answers to be Scored by your TA 6) Scoring Scheme: Free Response 1 Pt Why is it important to align the cuvette in the sample holder the same way each time? Your Answer: It is important to align the cuvette in the sample holder the same way each time because if you don't, the wall thicknesses of different sides may be different. This might in turn affect the intensity of the light passing through the sample and therefore affect your results. Also one side of the cuvette is purposely frosted, this is the area where you are allowed to touch and shouldn't use as the main side. Text Answers to be Scored by your TA 7) Data Entry - No Scoring In part I step 3, you were instructed to weigh approximately 200 mg of the green chloro complex. Please enter the precise mass in milligrams of the green chloro complex used to prepare the solution. mg = Your Answer: 201 No Points Possible 8) Data Entry - No Scoring In part I step 2, you were instructed to dissolve the green chloro complex into approximately 35 mL of acidic solvent. Please enter the precise volume in milliliters of the acidic solvent used to prepare the solution. Your precision should be to a hundredth of a milliliter (e.g: 35.02). mL = Your Answer: 35 No Points Possible 9) Scoring Scheme: 3-3-2-1
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If you weighed out 203 mg of the green chloro complex and dissolved it in 35.14 mL of acidic solvent, the molarity of your stock solution would be 0.0202 M. Using your precise value of mass and volume that you entered above, please enter your calculated value for the concentration of the original green chloro complex stock solution in moles per liter. M
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This note was uploaded on 03/08/2011 for the course CHE 2C taught by Professor Enderle during the Summer '08 term at UC Davis.

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Spectroscopy Post-Lab - Q# Question Text 4) Scoring Scheme:...

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