Lab 14 procedure - Kinetics of a Chemical Reaction...

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Kinetics of a Chemical Reaction: Concentration Dependence of the Reaction of Iodide with Persulfate Part 1: 1. Place 8 inch test tubes in a rack. Using the stock solution containing 5.00 x 10 -4 M of iodine in a 0.002 M I 2 , prepare a series of solutions containing various concentrations of I 2 as indicated on the Data Sheet. 2. Setup the Vernier apparatus a. Press the Data Pro icon b. Press “New” to clear out any old data c. Press the arrow key on the colorimeter until the wave-length is set at 430 nm (the far lef LED will be lit). d. Follow step-by-step directions in slideshow to complete calculations. 3. The first cuvette shall be the “blank” that is filled with the KI solution. Using a second cuvette, determine the percent transmittance of solutions 1 through 7. Be certain to rinse the cuvette out each time with the solution whose %T you are going to measure. Plot log T vs. I
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Unformatted text preview: 2 and draw The smooThesT curve Through your plo´ed poinTs, even if iT’s noT a sTraighT line. ²hus curve will be used laTer in The experimenT To converT %² readings direcTly inTo molariTy of I 2 . ParT 2: 1. ObTain 50 mL of a 0.05 M KI, 75 mL of 0.05 M K2S2O8, and 75 mL of a 2 M KNO3 in clean, dry, conTainers. 2. ²he raTe of reacton for solutons A – ± will be sTudied one aT a tme. 3. ²he ³rsT Three subsTances are measured in a clean, dry 7-inch TesT Tube, The S2O8 soluton is measured in a second clean, dry 7-inch TesT Tube. ²he colorimeTer is To be calibraTed wiTh The blank KI cuve´e before each run. ²he solutons should be prepared one aT a tme. 4. SeT up The Vernier apparaTus as before 5. ±ollow This procedure for 6 runs....
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