Using UV-vis spectroscopy to determine the kinetics of bromophenol blue

Type :

Term papers

Pages :

5 pages

Format :

.doc

Published date :

04/25/2009

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Table of Contents Using UV-vis spectroscopy to determine the kinetics of bromophenol blue Table of Contents

 
  1. Introduction
  2. Results
  3. Discussion
  4. Conclusion
  5. References

Abstract

The purpose of this lab is to determine the rate constant and order of reaction for an acid-base indicator, bromophenol blue. bromophenol blue (BP) displays a color change from yellow to purple in the pH range of 3 to 4.5. In strong alkaline solutions, the dye becomes unstable and decomposes due to a reaction with hydroxide ions, as follows: . UV-vis spectroscopy will be used to record the absorbances at the wavelength of maximum absorbance.
The full differential rate law can be derived from the above reaction: , where k is the rate constant and x and y are the orders of reaction for bromophenol blue and the hydroxide ions respectively.1 However, a large excess of hydroxide will be used, allowing the concentration to remain constant throughout the experiment and allowing one to simplify the equation with respect to BP. The rate law for the disappearance of bromophenol blue is derived: .

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About the author :

pencil image Apar G.  
Level :General public Study : Medical studies School/University : Boston University

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