Lab 4 Post Lab

# Be sure to include a title axis labels and use the

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Be sure to include a title, axis labels, and use the chart type that connects the data points. Note: You added a volume of water to the test tube. Assuming a density of 1.0g/mL, enter the g of water used in this part of the experiment. Use this when calculating the solubility in the table below. 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) = (4.9) / (1.25E04 M-1 cm-1) = 3.93E-04 M Type your calculation for moles of Fe2+ moles Fe2+ = (molarity of Fe2+) x (volume of ferroin complex solution) = 3.92E-04M x 0.010L = 3.92E-06 moles Type your calculation for grams of (NH4)2Fe(SO4)2.6H2O grams of (NH4)2Fe(SO4)2 6H2O = (moles Fe2+) x (molar mass of (NH4)2Fe(SO4)2 6H2O) = (3.92E-06 moles of Fe2+) x (329.17 g/moles) = 1.54E-03 grams Type your calculation for % mass of (NH4)2Fe(SO4)2.6H2O in the crystals. % mass = ((grams of (NH4)2Fe(SO4)2 6H2O) x 100) / (mass of KNO3 crystals analyzed for purity) = 1.54E-03 grams x 100 / 0.108 grams = 1.432% 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. 300mL H2O 100mL KNO3 10mL (NH4)2Fe(SO4)2 6H2O Filter paper Weighing paper 2mL 0.23M hydroxylamine 5mL 1,10-phen 7g KNO3 Note: All sections of this report, must be typed. 0 0.5 1 1.5 2 2.5 0 5 10 15 20 25 30 % Impurity as a Funtion of Crystallizatoin Steps Crystallization Number % Impurity 0 0.5 1 1.5 2 2.5 0 20 40 60 80 100 120 % Mass KNO3 Recovered in Crystallization Steps Crystallization Number % of Original KNO3 Mass 20 30 40 50 60 70 80 90 0.00 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)
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