CHEM 14BL Fall 2003 Report Guideline for Experiment 2 Pre lab is due at the beginning of the lab section Refer to laboratory syllabus for the due date for both the pre lab and post lab report Both pre lab and post lab reports MUST be written inside your LAB NOTEBOOK The experimental procedure for this experiment is provided as handouts NOT THE ONE IN THE MANUAL I Pre lab Guideline i ii Title of the experiment Reference i e complete reference of the experiment including title of the lab manual author edition and page number of the experiment in the manual etc iii Short introduction Summarize in a few sentences about the background and the goal of the experiment Outline the kinds of technique that you will use in the experiment iv Procedures flowchart format v Pre lab study questions complete ONLY 1 2 4 5 6 on page 4 of the handouts Must show all work for FULL credit Note For question 2 you may assume that for EACH dilution process each piece of equipment can ONLY be used once and you can also assume that no combinations are allowed for the same kind of equipment i e you don t need to worry about the combination of a 10 mL and a 5 mL pipet vi Data observations start a NEW page in your notebook for this section Set up tables but leave blank refer to item 10 on page 5 of the handouts There is NO MSDS for this pre lab report CHEM 14BL Fall 2003 Report Guideline for Experiment 2 Refer to laboratory syllabus for the due date of the post lab report Post lab report MUST be written inside your LAB NOTEBOOK The experimental procedure for this experiment is provided as handouts Post lab Guideline This is a GROUP Report i e TURN IN ONLY ONE POST LAB PER GROUP Useful definitions for the report w v is defined as weight in grams of solute 100 mL of solution ppm is defined as mg of solute L of solution ppb is defined as g of solute L of solution A Data Data Analysis Write out the name of each group member on your report as well as the individual responsibility when performing the experiment and writing the report i Set up a data table with columns for wavelengths you collected for your spectrum and the absorbances for the solutions you collected Fill in the experimental data on the data table At this point you will only have data entries for one row and one column of the data table You will fill in the rest of the data table later on in the report ii Description of the serial dilution procedure and rationale for the design of the dilution procedures iii Calculate the concentrations only molarity ppm and w v for all the solutions based only on the procedures that you designed iv The value for the molar extinction coefficient for the Brilliant Blue FCF is reported in the literature at 620nm 5 1 1 as 1 38X10 M cm Using this value and the measured absorbances at 620nm you collected in the lab calculate the experimental concentrations M for each of the 3 most diluted solutions You may assume L 1cm B Graphs Note any plots that are generated from computer software will NOT be accepted for grading for this experiment i Using millimeter graph paper plot a Beer s law calibration curve concentration M as x axis and absorbance as y axis based only on the calculated concentrations and measured absorbance for the three most diluted solutions at 620nm ii Using millimeter graph paper plot the spectrum use absorbance as y axis and wavelengths as x axis for one of the diluted solutions that you chose to measure during the lab Note DO NOT use the papers inside your lab notebook to plot the graphs You MUST use mm graph papers to plot the graphs You can purchase those in the ASUCLA bookstore CHEM 14BL Fall 2003 Report Guideline for Experiment 2 Refer to laboratory syllabus for the due date of the post lab report Post lab report MUST be written inside your LAB NOTEBOOK The experimental procedure for this experiment is provided as handouts Post lab Guideline This is a GROUP Report i e TURN IN ONLY ONE POST LAB PER GROUP C Error Analysis refer to example in lecture guide 1 i Calculate the Inherent Error molarity only for the FINAL i e the most diluted one solution that you prepared Must show all work for full credit Note Absolute errors for all the lab equipment are listed on p 27 of the manual ii Calculate the difference between the calculated concentrations part iii under Data and Data Analysis and the measured values part iv under Data and Data Analysis for the three most diluted solutions at 620nm D Complete all the items listed under Discussions and Extrapolation refer to page 7 of the handouts E Complete all the items listed under Practical Considerations refer to page 8 of the handouts F Conclusions Summarize data Explain the effect of wavelengths on the Beer s law calibration graph i e the one with absorbances and concentrations
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