Chem152_Calib_Report_092411

Chem152_Calib_Report_092411 - Briana Tran Name ID Number...

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Name: Briana Tran Section: BC ID Number: 1129589 Lab Partner: Victoria Saykal y Total Points = 60 pts (5 pts notebook, 55 pts template) DATA, GRAPHS AND CALCULATIONS 512.93 nm 1 pt Creating the calibration curve: Ferroin: Concentration (M) Absorbance 1.25E-05 0.140 2.50E-05 0.260 2 pts 3.75E-05 0.380 5.00E-05 0.580 6.25E-05 0.730 4 pts Slope of Absorbance versus concentration graph 12000 1 pt y-intercept of Absorbance versus concentration graph -0.032 1 pt Detailed calibration equation: y = 12000 x - 0.032 2pts Determining theAmount of Iron in an Iron Tablet 1) Average mass of a tablet 436 mg (provided in manual) 2) Mass of crushed tablet used in analysis 21 mg 1 pt 3) Final volume after filtered crushed tablet solution 10 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 0.100 1 pt (lab manual Part I I, Step 3) 7) 3 pts 8) 2 pts 9) 3 pts 10) 2 pts 11) 3 pts 12) mg of iron per tablet as listed on the bot le 27 mg λ 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? ( 10 pts: roughly divided 1 for the goal and 3 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. We wil use absorbance spectroscopy to generate a calibration curve to determine the concentration of ferroin in the tablet solution. Five standard solutions of dif erent concentrations wil be prepared from a 6.25 x 10-4M stock solution of ferroin. A solution containing some of a crushed iron tablet ( tablet average weight = 436mg) and HCl, wil be heated then filtered.
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