Experiment 19: Kinetics : the Rate of an Experiment

March 17, 2013 March 17, 2013 Name : Ryan annasdass arokiasamy ID : 1206875 Group Members : Chan Pei Qie,Chong Ven Yen Name : Ryan annasdass arokiasamy ID : 1206875 Group Members : Chan Pei Qie,Chong Ven Yen trial 19 kinetics : the consider of a chemical counteraction trial 19 kinetics : the consider of a chemical counteraction Results Part A [I-] / mol dm-3| [S2O82-] / mol dm-3| [S2O32-] / mol dm-3| Duration /s| Objurgate of I2 shape / mol dm-3 s-1| 0. 2| 0. 2| 0. 01| 1. 25| 0. 1600| 0. 2| 0. 15| 0. 01| 13. 37| 0. 0150| 0. 2| 0. 10| 0. 01| 26. 00| 0. 0077| 0. 2| 0. 05| 0. 01| 66. 5| 0. 00075| Part B [I-] / mol dm-3| [S2O82-] / mol dm-3| [S2O32-] / mol dm-3| Duration /s| Objurgate of I2 shape / mol dm-3| 0. 2| 0. 2| 0. 01| 3. 45| 0. 0580| 0. 15| 0. 2| 0. 01| 7. 56| 0. 0198| 0. 10| 0. 2| 0. 01| 9. 06| 0. 0110| 0. 05| 0. 2| 0. 01| 23. 91| 0. 0021| Part C Initial atmosphere/ OC| Final atmosphere/ OC| Duration t /s| Objurgate of I2 shape / mol dm-3| 1/T (1/K)| Log t | 15| 21| 29| 0. 00690| 0. 003472| 1. 462| 24| 25| 20| 0. 01000| 0. 003367| 1. 301| 35| 42| 13| 0. 01538| 0. 003247| 1. 114| 45| 40| 8| 0. 02500| 0. 003145| 0. 903| Calculations & Questions
Associated essay: Measuring Counteraction Objurgate Using Volume of Gas Resultd
The pi of atmosphere is that it increases the objurgate of counteraction, observed here by the better atmospheres giving a abundant fixeder counteraction duration a) Is counteraction (2) fixed or lazy with i-elation to counteraction (1)? Explain your reasoning or chronicles any criterion you do to succor fullure your blank Counteraction (2) is fixed with i-elation to counteraction (1). Counteraction (2): I2+2 S2O32-> 2 I-+ S4O62- occurs greatly fixed, I2 constructed in the counteraction is consumed restraintthwith and when the limiting proxy S2O32- is used up, I2 counteracts with the lugubriousness indicator to construct a bluish perversion disconnection. ) Does counteraction (1) or (2) guide the duration required restraint the bluish colour to show? Counteraction (1): 2I-+ S2O82->I2+2SO42- guides the duration required restraint the bluish colour to show as it is the I2 that fullure counteract with the lugubriousness indicator to result the bluish perversion disconnection to show c) Count the objurgate of shape of I2 in mol dm-3 s-1 restraint each trial at opportunity atmosphere and concoct this objurgate i) Abutting [S2O82-] at regular [I-] ii) Abutting [I-] at regular [S2O82-] The objurgate of shape of I2 can be congenial by careful of the objurgate of exexchange of the thiosulphate ion aggravate the duration charmed Objurgate of shape of I2=? I2]t d) What are the shapes of these concocts? They are unswerving succession graphs ,with the y axis undeviatingly proportional to the x axis e) What is the sentiment of this? This shows that the objurgate is undeviatingly proportional to the attention of [I-] and [S2O82-] and by careful the gradient of the graph we fullure fullure the objurgate of counteraction. f) Write the objurgate equation restraint counteraction (1) d[I2]dt=k[S2O82-] And count the objurgate regular , k Objurgate = k[I-][S2O82-] k = Objurgate / [I-][S2O82-] k = mount / [S2O82-] k = [(0. 015-0. 0008)/(0. 15-0. 05)]

Objurgate regular k = 0. 142 mol-1 dm3 s-1 g) Count the motive of activation of the counteraction If we concoct a graph of log t abutting 1/T, we can fullure the Ea by careful the mount. Mount of the graph = Ea / 2. 303R Ea / 2. 303R = (1. 462-0. 903)(0. 003472-0. 003145) Ea / 2. 303R = 0. 559/(3. 27×10-4) Ea = 1709. 48 x 2. 303R Ea = 1709. 48 x 2. 303 x 8. 314 Ea = 32731. 65 J/mol Discussion Precautions Among some of the precautions charmed were to impair gloves , prophylactic goggles and lab coats to dodge any damnification in instance of snare to chemicals.
Secondly, there were sepaobjurgate measuring cylinders unhesitating restraint each disconnection as to referable compound 2 disconnections in a measuring cylinder to dodge any counteractions. The persulphate was poured in ahead as this is an greatly fixed plod and has to be poured full at uninterruptedly. Finally,when diluting the persulphate disconnection, it was dindividual as accurately as potential in adjust to dodge a injustice attention instead of the individual purposed. Blank Based on the trial dindividual as courteous as the resolution of the results and following doing excite results, we feel knowing that the activation motive of the counteraction is 32. 73 kJ.
Furthermore, we feel gained an recognition into the kinetics of a counteraction, its objurgate, the objurgate regulars as courteous as the objurgate of counteraction. References: Martin S. Silberberg, Chemistry the Molecular Nature of Matter and Exchange, Fifth Edition, McGraw Hill, 2005. F. Albert Cotton, Geoffrey Wilkinson, Carlos A. Murillo, and Manfred Bochmann, Advanced Inorganic Chemistry, Sixth edition, John Wiley& Son. 1999. F. Albert Cotton, Geoffrey Wilkinson, Paul L. Gaus, Basic Inorganic Chemistry, Third Edition, John Wiley& Son. 1995. John C. Kotz, Paul M. Treichel, and Gabriela C. Weaver, Chemistry and Chemical Counteractivity, Sixth Edition, Thomson 2006.

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