LAB 5. KINETICS IODINE CLOCK REACTION (ONLINE VERSION) Experiment. http://web.mst.edu/~gbert/IClock/Clock.html Youtube Videos....

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LAB 5. KINETICS IODINE CLOCK REACTION (ONLINE VERSION) Experiment. http://web.mst.edu/~gbert/IClock/Clock.html Youtube Videos. https://www.youtube.com/watch?v=VXfbzwAv2Dc&ab_channel=TheOrganicChemistryTutor https://www.youtube.com/watch?v=_qhYDuJt8fI&ab_channel=koen2all https://www.youtube.com/watch?v=NjfcYSNnPKI&ab_channel=METUOpenCourseWare https://www.youtube.com/watch?v=1ueSa6-UqYo&ab_channel=NileRed (Traffic Light Experiment) DATA. Before mixing Total Volume After mixing (initial conc.) Run T KIO3 50.0 mL H3AsO3 0.0030 M KI 50.0 mL KIO3 H3AsO3 KI Time seconds 1 25oC 0.010 M 0.0030 M 0.10 M 100 mL 0.0015 M 2 25oC 0.020 M 0.0030 M 0.10 M 100 mL 0.0015 M 3 25oC 0.010 M 0.0030 M 0.20 M 100 mL 0.0015 M 4 5oC 0.010 M 0.0030 M 0.10 M 100 mL 0.0015 M 5 15oC 0.010 M 0.0030 M 0.10 M 100 mL 0.0015 M 6 25oC 0.010 M 0.0030 M 0.10 M 100 mL 0.0015 M 7 35oC 0.010 M 0.0030 M 0.10 M 100 mL 0.0015 M 8 45oC 0.010 M 0.0030 M 0.01 M 100 mL 0.0015 M http://web.mst.edu/~gbert/IClock/Clock.html https://www.youtube.com/watch?v=VXfbzwAv2Dc&ab_channel=TheOrganicChemistryTutor https://www.youtube.com/watch?v=_qhYDuJt8fI&ab_channel=koen2all https://www.youtube.com/watch?v=NjfcYSNnPKI&ab_channel=METUOpenCourseWare https://www.youtube.com/watch?v=1ueSa6-UqYo&ab_channel=NileRed DISCUSSION. http://web.mst.edu/~gbert/IClock/discussion.html Important concept: After mixing the concentration of H3AsO3 is always constant: 0.0015 M 6 H+ + IO3 - + 8 I- → 3 I3 - + 3 H2O H3AsO3 + I3 - + H2O → HAsO4 2- + 3 I- + 4 H+ IO3- + 3 H3AsO3 → I- + 6 H+ + 3 HAsO42- From the last equation, we can see that the rate of reaction is 1/3 of the rate of disappearance of the arsenious acid. When the arsenious acid is depleted the triiodide ion gives a blue color which indicated the end of the chemical reaction. I3 - + starch → blue-complex rate = - Δ[IO3-]/Δt = - (1/3) Δ[H3AsO3]/Δt CALCULATIONS. 1. Find rate of reaction for Run 1, Run 2, Run 3. 2. Find order of the reaction with respect to KIO3, KI and H3AsO3. 3. Write Rate law for the overall reaction. 4. Find kR after finding the rate law. 5. With help of Run5 to Run 8, plot graph in Excel of lnT vs I/t. Find the slope and find Ea http://web.mst.edu/~gbert/IClock/discussion.html