4AC Guide - Chem 6BL Experiments 4A-C Practical Guide...

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Chem 6BL Experiments 4A-C Practical Guide Page 1 of 10 EXPERIMENT 4A Synthesis of an Iron (III) Oxalate Complex In this experiment, you will synthesize a coordination compound K w [Fe x (C 2 O 4 ) y ] z H 2 O in which iron (III) coordinates with oxalate ion, the anion of a diprotic organic acid. After isolating and purifying the compound, you will analyze it for its composition of oxalate (Experiment #4B) and iron (Experiment #4C) using two different analytical chemistry techniques: oxidation-reduction titration and spectrophotometry. Based on the results of your analyses, you will then be able to calculate the empirical formula of the compound. This guide contains a list of expected learning outcomes, laboratory procedures & laboratory report hints, and some of the common lab-specific questions often asked by students in this course. The identity of the author(s) of any new questions posted will remain anonymous. However, I reserve the right to modify any of the questions in order to provide clarity to the reader. EXPECTED LEARNING OUTCOMES Upon successful completion of this experiment, the students should be able to: Use proper technique for decantation Evaluate the limiting reagent in a chemical synthesis Write balanced equations from an experimental procedure Use observational clues to assess reaction progress Understand the process of crystallization of a product as a solid Calculate the % yield for a chemical synthesis Write an organized formal laboratory report reflecting the student’s ability to analyze data and draw conclusions
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Chem 6BL Experiments 4A-C Practical Guide Page 2 of 10 LAB PROCEDURE Consult your TA for the various synthesis steps. They can be tricky. .. Write down everything! Include scrap of Data and visible Observations for this experiment in your "raw data"- standard pipet volumes, solution and precipitate colors , p H/litmus results, morphology (i.e. size and shape) of any crystallites, etc.! YOU WILL NEED THIS DATA FOR THE RESULTS SECTION OF YOUR EXPERIMENT #4A WORKSHEET! If, after letting your product sit in your drawer (overnight, etc.), you still don't have much (solid) product, place your product beaker in an ice bath and add more ethanol ! Often, this process will crystallize out more product. If you still fail to get any product, check with your fellow students and your TA - They may have extra product that they can give to you for use in Experiments #4B & #4C. . LAB REPORT Experiment #4A uses a worksheet . Read the worksheet carefully so that you know which sections you need to write up in your lab notebook and which sections are written into the worksheet directly. In the
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4AC Guide - Chem 6BL Experiments 4A-C Practical Guide...

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