Designing an Experiment

Designing an Experiment - Designing an Experiment Chemistry...

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Unformatted text preview: Designing an Experiment Chemistry 223 Fall, 2010 Why Teach Method Development? The heart of analytical chemistry. Writing cookbooks is more lucrative than buying them. Devising instructions is more fun than following them. Demonstrate the use of what has been learned where the answer isnt in the back of the book. New Enough to Be Interesting, Old Enough to Be Workable Ni 2+ previously determined spectrophotometrically. Other possible techniques covered in Chem 222. Contrasts between methods have been limited. How we decided on volumes, concentrations, temperatures, etc. hasnt always been clear. Devising conditions appropriate to a sample is a problem commonly faced in the sciences. What is the Universe of Techniques? Mass Spectrometry Atomic Emission Atomic Absorption X-ray Fluorescence EDTA Titration (forward or reverse) Quinoxaline Complexation (with or without separation) Dimethylglyoxime Gravimetry Common but not in Chem 223 Used in Chem 222 or Chem 223 Choice Considerations I Amount of sample Other elements present Solubility Detection limits and dynamic ranges Expected deterministic and random errors Ways to overcome error sources Speed, convenience, cost, familiarity Choice Considerations II Once technique chosen, work out all specific details (masses, volumes, temperatures, buffers, sample preparation) Do the same with other competing methods Compare Envision yourself doing the experiment. What would you want to know? Is it in the procedure? Do error propagation calculation Critically evaluate if method would work. If We Had the Time Youd do the lab 2 ways: your way, and the way of another group....
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Designing an Experiment - Designing an Experiment Chemistry...

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