Kinetic Studies of the Ferroin Complex.pdf

Kinetic Studies of the Ferroin Complex.pdf - Kinetic...

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Kinetic Studies of the Ferroin Complex Bola A. Habib AB3 December 12, 2017
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Abstract This lab focused on the study of the ferroin in three different reactions. In this lab, ferroin is reacted with three different reactants. The goal of this lab is to determine a, b, A, E a , k (rate constant), and the initial rate of each of the different reactions. 1 mL Mohr pipets were used to in order to fill the cuvettes with the right amount of reactant (Cu(NO 3 ) 2 , Na 4 P 2 O 7 , HNO 3 ), water, and ferroin. The Spec-20 was also used in order to keep track of the absorbance of ferroin throughout the experiment. After calculations and graphs were done in Excel, it was determined that the reaction is first order with respect to ferroin and zero order with respect to the non- ferroin reactant Na 4 P 2 O 7. Introduction There are three major parts to general chemistry that every STEM student should be familiar with: stoichiometry, thermodynamics, and kinetics. These three parts explain “what” happens, “why” it happens, and “how” it happens, respectively. This lab is focused on the kinetics of ferroin reacting with three different reagents. With kinetics, we are able to determine exactly how a reaction happens. This means that we can determine the rate of a reaction at any given time. We can also find out how different components of the reaction contribute and affect the reaction. In order to determine the reactions rates, the concentrations of the reactants and products need to be measured over the length of the reaction. In a study, the stoichiometry and kinetics of anaerobic ammonium oxidation with trace addition of N 2 H 4 was determined. With the stoichiometry and kinetics, the utilization rate, half-saturation, and inhibition constant of N 2 H 4 were determined. 2 The concentrations of both the reactants and products can be measured by spectrophotometry at a wavelength where no other reactant or product in the system absorbs light. In this lab, the wavelength used was 510 nm, the wavelength of the ferroin absorbs light. At that wavelength, the spectrophotometer measures the absorbance of ferroin before it reacts. As the reaction continues ferroin decomposes and loses its color. Evidently, the change of absorbance is directly proportional to the change of the concentration of ferroin. A study was conducted to determine the quantitation of Amorolfine. Measurements of the changes of absorbance was done at 610 nm. In order to increase the sensitivity, different experimental reaction parameters were studied and optimized by the multivariate method. 3 With kinetics, comes the study of catalysts.
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Catalysts are substances that when added to a reaction, increase the rate at which the reaction happens. Catalysts remain unused throughout the reaction. In a study done at Sharif University in Iran, a solid 1%Li/Ca-La mixed oxide catalyst was prepared and used in the transesterification reaction of canola oil for biodiesel synthesis. Then the kinetic model was studied and its parameters were determined.
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