Delaney Chem162_FractCryst_Report_012812

Note data is being restated here for ease in plotting

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Note: Data is being restated here for ease in plotting. The cells for % impurity will autofill from cells G56, G122, and G155. Use the “slope” and “intercept” functions in Excel to get the slope and y-int. for calculating Hºsoln and Sºsoln. You did this in the report for Lab 2. By signing below, you certify that you have not falsified data, that you have not plagiarized any part of this lab report, and that all calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this declaration will result in 5 points being deducted from your report score. Signature: Type your calculation for molarity of Fe2+ (1 mol ferroin = 1 mol Fe2+ ) Molarity of Fe2+=(absorbance of Fe(phen)3 2+)/(molar absorptivity of ferroin) (3.9)/(1.25E+04)/M*cm = 3.12E-04M Type your calculation for moles of Fe2+ moles Fe2+=(molarity of Fe2+)x(volume of ferroin complex solution) =(3.12E-04M)x(0.01L) = 3.12E-06moles Type your calculation for grams of (NH4)2Fe(SO4)2.6H2O grams of (NH4)2FE(SO4)2*6H2O=(moles of Fe2+)x(molar mass of (NH4)2FE(SO4)2*6H2O) = 3.12E-06 moles of Fe2+ x (392.14g/mol) = 1.22E-03 Type your calculation for % mass of (NH4)2Fe(SO4)2.6H2O in the crystals. %mass=((grams of (NH4)2FE(SO4)2*6H2O *100)/(mass of KNO3 crystals analyzed for purity) = (1.22E-03gx100)/(0.105) = 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, collected in a container for disposal by the UW Environmental Health & Safety department, or released into the environment. Based on the written 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. 200 ml H2O 100 mL KNO3 10 mL (NH4)2FE(SO4)2*6H2O Filter paper 2mL 0.23M hydroxylamine 5mL 1, 10-phenanthroline 7g KNO3 Note: All sections of this report, must be typed. 0 0.5 1 1.5 2 2.5 0.000 2.000 4.000 6.000 8.000 10.000 12.000 % Impurity as a Function of Crystallization Steps Crystallization Number % Impurity 0 0.5 1 1.5 2 2.5 0.0 20.0 40.0 60.0 80.0 100.0 120.0 % Mass KNO3 Recovered in Crystallization Steps Crystallization Number % of Original KNO3 Mass 15 20 25 30 35 40 45 50 55 60 65 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 Solubility of KNO3 Temperature (C) Solubility (gKNO3/100g water)
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern