week 9 eln.pdf - CHEM 178L Spring 2018 Natalie Burgoyne Weekly Notes\/Week 9 PDF Version generated by Natalie Burgoyne [email protected]:10 AM CST Table of Contents

week 9 eln.pdf - CHEM 178L Spring 2018 Natalie Burgoyne...

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CHEM 178L Spring 2018 - Natalie Burgoyne Weekly Notes/Week 9 PDF Version generated by Natalie Burgoyne on Mar 10, 2018 @01:10 AM CST Table of Contents Week 9 .................................................................................................................................................................................................................................................................... 2
Natalie Burgoyne Mar 07, 2018 @05:14 PM CST Week 9 Natalie Burgoyne Mar 06, 2018 @01:19 PM CST Week 9 - Solubility Product Constant Name: Natalie Burgoyne Partner: Nicolas Ronkar Natalie Burgoyne Mar 06, 2018 @01:19 PM CST Pre Lab Writing Weekly Notes/Week 9 2 of 9
Natalie Burgoyne Mar 06, 2018 @11:18 PM CST Investigation Questions:To determine the amount of iron (III) in a solution, how will Beer's Law plot be used?What is the solubility product constant for iron (III) oxalate and what is the significance of this constant? Procedure: Part 1: a. Prepare 10mL of 0.1M Fe2+ solution. After salt has dissolved, add 10mL of 0.1M H2C2O4 and stir the solution. Allow the solution to stand for most of the lab. b. Near the of lab, suction filter the FeC2O4 2H2O crystals using a Buchner funnel. Wash the crystals 3 time using distilled water. c. Add the crystals to 100mL of DI water in a 125mL Erlenmeyer flask. Seal the flask with parafilm and let stand in a locker. Part 2: Preparation of Stock Solution a. Dissolve appropriate amount of Fe(NH4)2(SO4)2 6H2O in 50mL of water containing 1mL of concentrated H2SO4. b. Transfer solution to a 1L volumetric flask and dilute to exactly 1 liter and mix. Beer's Law Plot a. Prepare following solutions in 6 100mL volumetric flasks. Put 1mL of 10% hydroxylamine hydrochloride, 5mL of 0.1% 1,10-phenanthroline, and 1 mL of 10% sodium acetate in each of the flasks. Dilute contents of one flask to 100mL with distilled water and label "blank" For the remaining flasks, calculate the amount of stock solution to use to have a evenly distributed range of concentrations fro, 20- 100uM. Add required volumes of each stock solution to each of the flasks and be sure to record calculations in ELN. b. Stopper each flask and mix thoroughly. Allow solutions to stand for 5 minutes while preparing spectrophotometer. c. Set wavelength to 508nm. Rinse cuvette 3 times with small quantities of the solution being measured. Fill cuvettes with 2/3 full of solution. Blank the instrument and measure absorbance for each solution. d. Prepare a table and plot data. Plot with the Fe2+ concentration on the x axis and absorbance along the y-axis. e. Use google sheets to fit the best straight line. This line is the calibration curve. Part 3: a. Measure the temperature of the solution in equilibrium with solid iron(II) oxalate.

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