4AC paper guide

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

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Chem 6BL Experiments 4A-C Practical Guide Page 1 of 7 EXPERIMENT #4 GUIDE This guide contains a list of 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. Experiment #4A 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 Introduction section, provide some background on the type of synthesis you are doing - e.g. discuss coordination/complex (inorganic) chemistry, redox reactions, etc. The "real" results in this experiment include mostly Data and Observations ! (e.g. Data - actual masses used, actual volumes used, recordings of measured p H's and temperatures, etc.; Observations - note the color, size and shape of your product crystals, note colors of precipitates, etc.) Don't forget there are two pseudo-% yield calculations - make sure you include both on your Exp't #4A worksheet! In the Discussion section, simply fill in the boxes with your own values.
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Chem 6BL Experiments 4A-C Practical Guide Page 2 of 7 I wrote down all the masses, volumes, etc. from this lab in my Experimental section, but I still lost points for not including them again in my Results section. Why? ( Note: since Experiment #4A involves a worksheet , just make sure you fill in the worksheet completely ! Read the worksheet instructions carefully !!) The short answer is - because this is a synthesis experiment. The Experimental section is the "recipe", and the data from the Results section is the "proof" that you followed the "recipe". Put another way, there are several instances in this experiment where the lab manual tells
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4AC paper guide - Chem 6BL Experiments 4A-C Practical Guide...

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