'Determining Activation Energy\r'

' activation energy of a chemical reaction Mengyuan Wu IB Chem HL Richard Forster March 20, 2013 Introduction: In this experiment, a reduction of peroxodisulphate (VI) ions by iodine ions is investigated. reply of 10cm3 of K2S2O8, potassium peroxodisulphate, represented as ‘ event A’. Mixture of 5cm3 of KI (Potassium iodide firmness of purpose), and 5 cm3 of Na2S2O3 (sodium thiosulphate root), and 2. 5cm3 of starch solution is considered as ‘ stem B’.Solution A and B ar mixed together under contrastive temperatures to show a â€Å"clock” reaction. rumination: dodge 1: Raw duodecimal Data of Temperature and meter from the Experiment persistent / Ideal Temperature (°C)| Temperature of Solution A (°C±0. 5°C)| Temperature of Solution B (°C±0. 5°C)| Time Taken| Time Proceeded ( instants±1 seconds)| 30| 31. 0| 31. 0| 3:10:34| 191| 35| 36. 0| 33. 5| 2:11:83| 132| 40| 40. 0| 38. 0| 1:37:24| 97| 45| 46. 0| 45. 5| 1:12:83| 73| 50| 51. 0| 51. 0| 0:52:40| 53| Qualitative: to begin with: Solution A: run dull solutions; Solution B: clear colourationless solution During: Both solution A and B reached (or close to) a amend temperature and mixed together form a clear colorless solution reaction prison term: one or fewer section of the solution turned clear light purple cloudy purple, past the section expand to the entire solution speedily within a second the purple opaque solution stepwise turn to a darker purple color After: Dark purple-black colored opaque solution Processing and Presenting Data: circuit card 2: Uncertainty of the Apparatus apply in the Experiment Equipment| Uncertainty| commentary| Stopwatch| certifys±1 second| The veritable question of the stopwatch is millisecond, shown in the column ‘Time Taken’ in display panel 1. However, there are human reaction uncertainties when receiving the change in color in the actual experiment, so that particular misgiving is pr esented by ±1 second| 50cm3 burette for K2S2O8, KI, and Na2S2O3| cm3±0. 02cm30. 02% for each solution| Initial rendering (±0. 1cm3) + Final reading (±0. 1cm3) = volume use (±0. cm3) for every solution measured in mixture A or B| 10mL Measuring Cylinder for starch solution| mL±0. 2mL| | Thermometer| °C±1. 0°C| Mixture A and B twain have separate (but relatively close) temperature with uncertainty of ±0. 5°C each, after the ordinary of the two the uncertainty doubles| Table 3: Processed date for temperature and time clean Temperature of the reaction (°C±1. 0°C)| Proceed Temperature (K±1. 0K)| Time Proceeded (seconds±1 seconds)| 31. 0| 304. 0| 191| 35. 0| 308. 0| 132| 39. 0| 312. 0| 97| 46. 0| 319. 0| 73| 51. 0| 324. 0| 53|Table 4: Processed selective information for interpreting ln 1t (3 sig fig)| 1T (K)(4 sig fig)| -5. 25| 0. 003289| -4. 88| 0. 003246| -4. 57| 0. 003205| -4. 29| 0. 003134| -3. 97| 0. 003086| ln 1t=lnK (Proportional ) t= Time T= Temperature (in K) Graph1: deliberation: Values: Table 4: unhurriedness to Process Temperature: | | deliberation 1: Average Temperature (°C±1. 0°C)| computer science 2: Temperature in K (K±1. 0K)| | shape| Temp. of A+Temp. of B2| Temp. in °C+273| unyielding / Ideal Temperature (°C)| 30| 31. 0+31. 02=31. 0| 31. 0+273=304. 0| | 35| 36. 0+33. 52=34. 75? 35. 0| 35. +273=308. 0| | 40| 40. 0+38. 02=39. 0| 39. 0+273=312. 0| | 45| 46. 0+45. 52=45. 75? 46. 0| 46. 0+273=319. 0| | 50| 51. 0+51. 02=51. 0| 51. 0+273=324. 0| Table 5: Calculation for Graphing Data | Calculation 3:ln 1t| Calculation 4:1T(K)| Fixed / Ideal Temperature (°C)| 30| ln1191? -5. 25| 1304? 0. 003289| | 35| ln1132? -4. 88| 1308? 0. 003246| | 40| ln197? -4. 57| 1312? 0. 003205| | 45| ln173? -4. 29| 1319? 0. 003134| | 50| ln153? -3. 97| 1324? 0. 003086| Calculation 5 (Activation Energy): lnk= -EaR ? 1T+lnA y = m(slope) x + c R=8. 314 Jmol-1K-1( diploma)Data from Graph 1: y = -6045. 3x + 14. 705 -6045. 3 = -EaR Ea=8. 314 ? 6045. 3 =50260. 6242 J =50. 2606242 KJ hit-or-miss wrongful conducts: Calculation 6: (%Random erroneous belief for Average Temperature of the Reaction) Average temperature of the reaction K ± 1. 0 K (Refer to Table 2) % misplay=1. 0304. 0+1. 0308. 0+1. 0312. 0+1. 0319. 0+1. 0324. 0? nose candy ? 1. 596% Calculation 7: (%Random Error for Time) Time Taken Seconds ± 1 Second (estimated human reaction time) (Refer to Table 2) % Error=1191+1132+197+173+153? light speed? 5. 569% Calculation 8: (% Random Error for Solutions) Random Error for K2S2O8+KI+ Na2S2O3+Starch 0. 02%? 3+0. 22. 5? 100 ? 8. 06% Calculation 8: (Total % Random Error) % Error=1. 596%+5. 569%+8. 06% =15. 225%=20% (one sig. fig. ) Final Answer: Calculation 9: (Final Answer) 50. 2606242 KJ ±20% 50. 2606242 KJ =50. 3 KJ (3 sig. fig. >smallest sig. fig. in calculation) 50. 2606242 KJ? 0. 2? 10. 052 KJ=10KJ (one sig. fig. ) Experimental Result: 50. 3 KJ ±10KJ 50. 3 KJ ± 20% Work Cited: Diploma Programme Chemistry Data Booklet. second ed. Cardiff: International Baccalaureate Organization, 2008. 6. Print.\r\n'