Belousov-Zhabotinsky-reaktionen & FKN-mekanismen

Kasper Alexander Brauner Hansen, Frederik Storm Mahler, Astrid Helmer Svendsen, Houssein Ali Elsalhi, Phillip Alexander Thorsted, Rebekka Denker Larsen & Preben Ladefoged Wolter

Studenteropgave: Semesterprojekt

Abstrakt

The report experimentally examines the Belousov-Zhabotinsky (BZ) reaction, which is an oscillating reaction. Futhermore, the report examines Field, Körös & Noyes’ mechanism (the FKN mechanism), and how it describes the BZ reaction. This is done by going through the theory behind the mechanism, deriving the summery reaction for the FKN mechanism, test if the predictions from the summery reaction were correct and performing potential measurements of the solution. The theory behind the mechanism covers redox chemistry, since all the reactions in the mechanism are redox reactions, as well as electrochemistry since the potential is measured. There have been made several experiments, where the concentrations of ferroin and ways of measuring have been changed. It was demonstrated that the period, in which the solution was oscillating became longer with higher ferroin concentrations. Furthermore, it was demonstrated that the bromide concentration was following the oscillations of oxidation and reduction of ferroin. Throughout the reaction, it was also demonstrated, that CO2 was produced but the expected amount did not satisfy the prediction from the FKN mechanism. On the basis of the experimental results and that the conditions of a chemical mechanism are not complied with the FKN mechanism, it is concluded that the FKN-mechanism has some flaws which implies that the description of the BZ reaction is not sufficient.

UddannelserBasis - Naturvidenskabelig Bacheloruddannelse, (Bachelor uddannelse) Basis
SprogDansk
Udgivelsesdato3 jun. 2014
VejledereSøren Hvidt

Emneord

  • Oscillation
  • Zhabotinsky
  • BZ
  • FKN
  • Belousov