Chemical Kinetics: the Iodine-Clock Reaction

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EXPERIMENT 3-CHEMICAL KINETICS: THE IODINE-CLOCK REACTION

J.CHAN1 and C.CABANLIG2
1NATIONAL INSTITUTE OF MOLECULAR BIOLOGY AND BIOTECHNOLOGY, COLLEGE OF SCIENCE
2NATIONAL INSTITUTE OF MOLECULAR BIOLOGY AND BIOTECHNOLOGY, COLLEGE OF SCIENCE
UNIVERSITY OF THE PHILIPPINES, DILIMAN, QUEZON CITY 1101, PHILIPPINES
DATE SUBMITTED: JANUARY 8, 2013
DATE PERFORMED: DECEMBER 5, 2012

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ABSTRACT

The kinetics of the reaction between persulfate (S2O82-) and iodide (I-) ions was studied in the experiment. Temperature, concentration of reactants and catalyst presence were the different factors examined if they had an effect on the rate of reaction between S2O82- and I-. The reaction of interest was timed by measuring the interval between reactant interaction and complexation of the product I2 as signified by the sudden appearance of a blue coloration. Results of the experiment indicated that the rate is first order with respect to each reactant and that the activation energy is high implying sensitivity to temperature. It was also determined that CuSO4 is a viable catalyst for the persulfate-iodide reaction.
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INTRODUCTION

Chemical kinetics is the study of reaction rates, the study of changes in concentration of reactants or products with respect to time (Silberberg, 508). There are various factors which determine chemical kinetics and changing them allows one to effectively control the speed of a chemical reaction. Temperature, concentration of reactants and presence of a catalyst are major factors that affect reaction rates (Alcantara et al, 15). This area of study is essential because it provides information on how fast a reaction proceeds and what could be done to control its speed. Knowledge of chemical kinetics enables industries to thrive and medicines to become effective.

In this experiment, the kinetics of the reaction between persulfate (S2O82-) and



References: Alcantara, C. et al, 2012. Analytical Chemistry Laboratory Manual. Quezon City: UP Diliman. 4-5 Athawale, V.D., Mathur, P., 2001. Experimental Physical Chemistry. New Delhi: New Age International (P) Ltd. 89 Atkins, P., de Paula, J., 2011. Physical Chemistry for the Life Sciences (2nd ed) Oxford: Oxford University Press. 236 Bassett, J. et al, 1989. Vogel’s Textbook of Quantitative Chemical Analysis (5th ed) Essex: Longman Scientific & Technical. 387 Brown, T. et al, 2012. Chemistry: The Central Science (12th ed) Glenview, Illinois: Pearson Prentice Hall. 565 Chang, R., 2011. General Chemistry: The Essential Concepts (6th ed) New York City: McGraw-Hill Companies, Inc., 1221. 472 Kinetic electrolyte effect (1997). In IUPAC Compendium of Chemical terminology (2nd Ed) Retrieved from: http://goldbook.iupac.org/PDF/goldbook.pdf Shakhashiri, B., 1992. Chemical Demonstrations: A Handbook for Teachers of Chemistry (vol. 4) Madison: The University of Wisconsin Press. 54 Silberberg, M., 2010. Principles of General Chemistry (2nd ed) New York City: McGraw-Hill Companies, Inc., 1221. 508 Whitten, K. et al, 2012. Chemistry (9th ed) Belmon, Ca: Cengage Learning. 639

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