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ID Number: Section: Lab Partner: Chem 142 Experiment 6: Calibration Curves and an Application of Beer's Law By signing below, you certify that you...

I'm stuck on this lab report. I've been very sick and don't really know what it's asking of me

Name: Section: ID Number: Lab Partner: Total Points = 55 pts (10 pts notebook, 45 pts template) DATA, GRAPHS AND CALCULATIONS 510.03 nm 1 pt Creating the calibration curve: Ferroin: Concentration (M) Absorbance 0 0.000 2.00E-01 0.300 4.00E-01 0.500 6.00E-01 0.600 8.00E-01 0.720 1.00E+00 0.850 4 pts Slope of Absorbance versus concentration graph 0.8014x+0.0943 y-intercept of Absorbance versus concentration graph 0.100 Detailed calibration equation: Absorbance= slope * M + b 2pts Determining theAmount of Iron in an Iron Tablet 1) Average mass of a tablet 27 mg 2) Mass of crushed tablet used in analysis 0 mg 1 pt 3) Final volume after filtered crushed tablet solution 100 mL is diluted in volumetric flask (lab manual Part I , Step 5) 4) Volume of diluted crushed tablet solution 5 mL transferred to the new volumetric flask 5) Final volume of ferroin complex solution 100 mL (end of lab manual Part I , Step 9) 6) Absorbance of the ferroin complex solution 0.420 1 pt (lab manual Part I I, Step 3) 7) 3 pts 8) 3 pts 9) 3 pts 10) 3 pts 11) 3 pts 12) mg of iron per tablet as listed on the bot le mg l max: M -1 Purpose and Method Clearly state the purpose of this part of the lab. Explain how this is accomplished in this experiment. What calculations do you need to perform? What measurements wil be made? [Do not provide experimental details here]. How do you go from calculated/measured values to accomplishing stated purpose? ( 4 pts: roughly divided 1 for the goal and 1 each for addressing each of the three parts of the experiment. ) The purpose of this lab is to determine the amount of iron in an iron supplement tablet. by preparing standard solutions from stock solution, obtain a calibration curve, and to use these in determining the concentration of an unknown solution. Concentration calculations wil need to be preformed, and crushed pil s wil need to be weighed out to the appropriate weight, in addtion to precise measurements while making the solutions. Once the solutions have been made, the experiment is completed, the data from the solutions can be measured and the concentration of iron in the sample weighed can be compared to determine the amount of iron present in the sample. Chem 142 Experiment 6 : Calibration Curves and an Application of Beer's Law Results and Discussion 1. Compare your mass of iron per tablet with the amount listed on the bot le label. Calculate the % error and discuss YOUR major sources of error. ( 4 pts ) 2. If you did not wait for the complete formation of the ferroin complex in Part I , step 10, how would your data look dif erent and how would this af ect your determination of the mass of iron in the tablet? ( 4 pts ) 3. You use atomic emission spectroscopy, another spectroscopic technique, to measure the Li + concentration in 5 standard solutions of varying concentrations of LiCl. The intensities for the standard solutions are plot ed versus the concentrations and the resulting calibration equation is: Intensity = 84,250 M -1 * [Li + ] + 2.25 If the intensity of your unknown sample is 115, what is the concentration of Li + in the analyzed sample? ( 4 pts ) If 2 mL of the original unknown sample was diluted to 250 mL prior to analysis, what is the concentration of Li + in the original solution? ( 4 pts ) Place your calibration plot here. Make your plot big enough to cover this instruction box so that it is large enought for someone else to read. This calibration plot is Abs vs. concentration of ferroin (M) (y vs. x) Use the online resources if you need help figuring out how to plot a graph in Excel. You should use a "scat er plot" that does NOT connect the data points. Title the graph and label the X and Y axis, including the correct units (Absorbance data is unitless). Be sure to double check your units and format ing once you print the report. Add a Trendline to show the linear fit of your data. Choose a linear line and choose the options that wil "display the equation on the chart". By signing below, you certify that you have not falsified data, that you have not plagiarized any part of this lab report, and that al calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this declaration wil result in 5 points being deducted from your report score. Signature: Using the calibration equation and the absorbance you measured for the prepared sample, calculate the ferroin concentration. Show your work and don't forget to include units. Based on the procedural steps and the ferroin concentration you just calculated, calculate the moles of ferroin in the final ferroin complex solution prepared in Part I , Step 9. Show your work. Based on the moles of ferroin in the final ferroin complex solution, calculate the moles of iron in the crushed tablet solution prepared in Part I , Steps 2-5. Show your work. Using the "moles of iron in the crushed tablet solution" you just calculated, calculate the mass (in mg) of iron in the crushed sample that you weighed out. Show your work. From the mass of iron in the crushed tablet sample you weighed out, calculate the mass (in mg) of iron in a whole tablet. Show your work. Laboratory Waste Evaluation (1 pt) Laboratory waste is considered anything generated during an experiment that is disposed of down the sewer drain, thrown in the garbage, col ected in a container for disposal by the UW Environmental Health & Safety department, or released into the environment. Based on the writ en lab procedure and your actions during the lab, list the identity and approximate amount (mass or volume) of waste that you generated while performing this experiment. Note: All sections of this report must be typed 0 0.2 0.4 0.6 0.8 1 1.2 0.000 0.100 0.200 0.300 0.400 0.500 0.600 0.700 0.800 0.900 f(x) = 0.8014285714x + 0.0942857143 Calibration plot Concentration of ferroin (M) Absorbance
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