NotesKinPrtsI&IIfall04 - Procedure Notes for...

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Procedure Notes for Kinetics Parts I and II. The background material for this lab can be found in experiment 22 of the lab text. Procedure Notes Part I Each group of two students will do one alkyl halide, in the two solvent systems assigned then share data with another group doing the other alkyl halide. The main modification from the lab text for Dr Pradhan was the creation of a second flask for each solvent system, so that we can get an average value for the infinity readings. This average value gives us a more accurate value for the infinity volume and allows us to determine how accurate our results are at a glance. If the two values are not within approximately 10% of each other there was a mistake made somewhere in the procedure. In order to use this correctly, please make sure that you prepare the two solvent system flasks in an identical manner. We will be preparing two stock alkyl halide mixtures using reagent grade acetone. This procedure makes 50mL of each halide mixture, which is more than what we need for the class to perform the experiment. For this reason we will make one of each of the halide solutions for the class to share. DO NOT add pure alkyl halide to your flasks. Use the prepared solution. We will be graphing ln (Vinf/(Vinf - Vt)) vs. time for this experiment therefore it is necessary to get a Vinf reading for each solvent system studied. This will be accomplished by allowing the reactions to proceed to “completion”. Vt is merely the individual cumulative volume of NaOH for a recorded color change at time (t). R-Br(aq) + H2O(aq) --> R-OH(aq) + HBr(aq) NaOH(aq) + HBr(aq) --> NaBr(aq) + H20(l) The reactions produce acid and the indicator we are using changes color from blue (basic) to yellow/green (acidic). We will be performing the titration sort of in reverse. Initially we add 1 mL of titrant (NaOH), which changes the indicator to blue. Then as the reaction produces acid which reacts with the NaOH the pH
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This note was uploaded on 07/10/2011 for the course BCH 4033 taught by Professor Stern during the Summer '11 term at UNF.

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NotesKinPrtsI&IIfall04 - Procedure Notes for...

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