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Experiment 10F(Chemistry TAS - Lab Report) - To determine the activation energy of the reaction between bromate ion and bromate(V) ion in acid solution

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Introduction

Experiment 10 Chemistry TAS Lab Report (short) 14thFebruary, 2006 Name: Shek Pok Man, Dominic Class: 6B (24) Objective: To determine the activation energy of the reaction between bromate ion and bromate(V) ion in acid solution. Discussion 1. 3Br2(aq) + C6H5OH (aq) --> C6H5Br3OH(s) +3H+(aq) + 3Br-(aq) 2. Methyl red was used because the solutions are colourless, the end point cannot be determined. However, using methyl red as indicator to give some color to the solution, at the end point the solution was bleached from red to colorless. 3. No, as the rate of reaction increase directly proportional to the temperature, at the temperature=80oC, the rate is so fast that tme interval connot be measured. ...read more.

Middle

We can substitute k by 1/t. b) By taking natural logarithm of k = Ae-Ea/RT, we have: ln k = (- Ea/RT)+ ln A C) Results: Original Temperature(K) Time(s) In(1/t) Final Temperature (K) (1/T) x10-3 303 70 -4.25 305 3.30 308 65 -4.17 310 3.24 313 55 -4.01 315 3.19 318 34 -3.52 319 3.14 323 26 -3.26 324 3.10 In(1/t) VS against 1/T By the equation: ln (1/t) = (- Ea/R)(1/T)+ ln A ?slope of the graph = - Ea/R (-5165.6)(8.31) = - Ea Ea = 42926kJmol-1 6. Temperature affects the rate of reaction as the kinetic energy of molecules increase when temperature increase, thus, increasing the collision frequency which affects the rate of reaction. ...read more.

Conclusion

In this experiment, 3Br2(aq) + C6H5OH (aq) --> C6H5Br3OH(s) + 3H+(aq) + 3Br-(aq) 5Br-(aq) + BrO3-(aq) + 6H+ --> 3Br2(aq) + 3H2O(l) Br2(aq) + H2O(l) --> HBr(aq) + HOBr(aq) As the rate of reaction of phenol and bromide approaches zero in normal condition, sulphuric acid was added to provide an acidic medium to increase the rate of reaction. The experiment is designed such that we can control the initial temperature of the reaction and record the different time taken. Thus, we can follow the reaction. 8. Conclusion The activation energy of the reaction between bromate ion and bromate(V) ion in acid solution was determined. It is 42926kJmol-1. ?? ?? ?? ?? - 1 - ...read more.

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