University of Washington CHEM 162 Chem 162 lab 4-reviewed by experts 2021

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Name: Kedar Mokate Quiz Section: AH Lab Partner: Cydni Marshall Student ID #: 1837621 CHEM 162 Experiment #4 Part I. Fractional Crystallization of KNO3 with (NH4)2Fe(SO4)2·6H2O Impurity Part II. ... Determining the Solubilty Curve of KNO3 Goals of this lab: • Demonstrate the purification of a solid sample using the process of fractional crystallization • Construct a solubility curve for potassium nitrate • Apply the mechanics of dimensional analysis and an understanding of solubility of solids to calculate % composition by mass, % impurity, % recovery, solubility product constant, enthalpy of solution formation, and entropy of solution formation • Apply Beer's law to detect the amount of impurity in a solid sample • Assess the accuracy of experimental data (compared to a known value) and identify sources of error • Use Excel to graphically represent and interpret experimental data Your lab report will be grade on the following criteria using a poor/good/excellent rating system: • Data and results are detailed, reasonable, and complete • Calculations are complete and correct, with proper use of significant figures and units • Conclusions are reasonable and logical • Error analysis is well-supported and valid • All graphs and tables are clearly and accurately labeled; entire report is typed 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 lab score. Signature: ________________________________________ This lab is worth 60 points: 10 points for notebook pages, 50 points for the lab report (Do NOT include your notebook pages when you scan your report for upload into Gradescope.) Laboratory Waste Evaluation 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. ~4 ml 0.23M hydroxylamine hydrochloride ~10 ml 3.6E-03 M 1,10-phenanthroline solution ~ 10g of KNO3 solid ~0.5 g of ferrous ammonium sulfate hexahydrate solid ~1L of DI water 2 Filter papers Few paper towels [Show More]

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