kinetics and spectroscopy2 - KING FAHD UNIVERSITY OF...

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KING FAHD UNIVERSITY OF PETROLEUM & MINERALS CHEMISTRY DEPARTMENT EXPERIMENTS IN PHYSICAL CHEMISTRY CHEM-311 Prepared For Dr.Badwi EXP # 6 kinetic study using spectroscopy Done By: Al-Ghamdi, Muhammed A ID#: 962403 ID#: ID#: SEC.#: 54 Date Of Performance: 26-3-2002 Date Of Submission: 2-4-2002
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INTRODUCTION I-Objective:- -To obtain the order of the reaction of crystal violet with hydroxide ion. -To obtain the rate constant of the reaction. II-Theory:- The reaction of crystal violet ( (CH 3 ) 2 N ) 3 C + with hydroxide ion ( OH _ ) to produce a colorless product through the following equation:- CV OH CVOH Voilet Colorless + - + and this reaction is first order. So, if we plot ln(2-log%T) vs. time we should get a straight line. III-Important Equations:- [ ] [ ] Rate d CV dt k CV m = - = + + ' [ ] k k OH n ' = - A I I Cl o = = log ε %T I I o = × 100 ( 29 A = = - log % log % 100 2 T T [ ] [ ] ln ' CV CV k t + + = - 2 1 ( 29 ln log% tan ' 2 - = - + T k t Cons t PROCEDURE
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As indicated in the experiments' manual. DATA Table-1: Raw Data Run#1 t(cm) % T 2.5 15 3.9 20 6.4 30 8.45 40 9.3 45 10.2 50 Run#2 t(cm) % T 0.8 45 1.45 40 2.15 55 2.8 60 3.4 65 4 70 Run#4
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