A Clock Reaction C12-3-05 & 09

A Clock Reaction C12-3-05 & 09 - A Clock Reaction:...

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HYDROGEN PEROXIDE IODINE CLOCK Introduction: Clock reactions are reactions in which the reaction rates can be influenced by factors such as temperature, concentration, catalysts and surface area. When one reactant is consumed or another chemical is produced an abrupt change in visible colour occurs. Since the factors influencing the reaction rate can be changed, the time for the reaction to occur can also be changed; thus the idea of a ‘clock’ reaction. Source: B. Z. Shakhashiri (1992) Chemical Demonstrations: A Handbook for Teachers of Chemistry , vol. 4. pp 37-43. The iodine clock reaction (or Landolt reaction) is a classic high school chemistry demonstration in which two colorless solutions are mixed. After 10 seconds or so, the colorless mixture suddenly turns blue. The reaction demonstrates a typical clock reaction and shows the effect of the interaction between chemical reactions that have different rates that are dependent on the concentrations of the reagents involved in the reaction. From Shakhashiri … “The sudden change from colorless to deep blue solutions in this demonstration
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A Clock Reaction C12-3-05 & 09 - A Clock Reaction:...

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