Lab 6 - Dry lab Calibration Methods and Introduction to UVVIS.pdf

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1 Lab 6 Calibration Methods and Introduction to UV-Visible Spectroscopy The lab is a dry lab; the report is an individual Work. Since it is a dry lab in this semester, all data will be given in completed tables during the dry lab’s Collaborate Ultra (CU) session. You must attend the CU session in time as so you can submit the lab report later. Absence in the CU session will result in a grade of Zero in that dry lab. Before the dry lab CU virtual meeting, you are supposed to: 1) Print the lab instruction, make three holes and insert them into your binder. 2) Type your answers to all the prelab questions into a Word document and drop the file into the correct d2l folder. Type your name on the first page. Show citation for references and use equation editor for calculations. Use proper units and correct number of significant digits. You can use this file as the preparation for your lab report. Note this due right before the dry lab starts! Before coming to lab: Review Section 4.8 and Chapter 5, Calibration Methods. Read this lab handout. The more time you spend figuring out your dilutions and “recipes” the less time you will have to spend in the lab. Learning Outcomes: Students will apply external standard and standard addition calibration methods to solve the concentration of an unknown (assessed in “Results and Discussion”-questions 5, 6). Students will understand the differences and uses of external standards, internal standards, and standard addition (assessed in “Results and Discussion”-question 8). Students will demonstrate mastery of Microsoft Excel for analysis of laboratory data (assessed in “Results and Discussion”-questions 1-4, 7). SDS: methanol, acetylsalicylic acid ( SDS summaries are omitted for dry labs ) For the lab report, type your responses to all pre-lab and post-lab questions and embed excel data tables and graphs into one single Word document and submit it in time. Make sure to include the code of the data set. Materials 1000 mL volumetric flask One 10-mL volumetric flask per group. p-1000 micropipettes and tips Concentrated HCl Mortar and pestle Methanol in a wash bottle to wet aspirin 250 mL storage bottles for the 2 v/v% HCl Acetylsalicylic Acid (pure powder) Aspirin Tablets (unknowns) UV-Vis spectrometer set to 236 nm Test tubes and test tube racks

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