Cyclic Voltammetry of Ferricyanide
Analytical Lab 1: 2410L
Benjamin A. Battiste
Group 2
10/14/15
Introduction: The purpose of this experiment is to use cyclic voltammetry to see how ferricyanide can be reduced to ferrocyanide. Using cyclic voltammetry a calibration curve will be created to determine the concention(mM) of an unknown solution of ferricyanide. In cyclic voltammetry, the potential of a substance is scanned starting from a certain voltage, going to another voltage, and then returning to the original, hence “cyclic” voltammetry. As current changes, a triangular waveform is created which looks like an upside down V. Using this triangular waveform, a voltammogram can be made by plotting current vs. potential. A voltammogram …show more content…
Using the both the cathodic and anodic peaks plotted against concentration of ferricyanide, the equations to solve to concentrations can be calculated. According to the Randles-Sevcik equation, the R2 values for both the cathodic and anodic calibration curves should be close to 1.00 due to the linearity. While they are both close to 1.00, the cathodic value is closer. This is to be expected however, because it is the first time the solution is being scanned so it will give better and more pure results. When determining concentration of the unknown, even though they are close, if any differences arise in concentration, the concentration found using the cathodic equation should be the one …show more content…
Also, the same equipment could be used to do all measurements to ensure readings are the same. Again, these are minor details but ones that could slightly alter the results for the better if taken care of.
Conclusion: Overall I thought that the lab was a success. Our lab group decided to work together and it paid off. Everything was smooth, everyone seemed more relaxed, and it appeared that people enjoyed being there more. The lab was interesting and everyone was excited when the graphs seen on the screen looked how they should. It’s always fun getting to use new equipment in the lab. The lab is fine the way it is, it works well and if done correctly with a group can actually be fun.
References:
Experiment 1: Cyclic Voltammetry of Ferricyanide, Excel Help, Chemistry 2410L, Fall Semeter 2015
Experiment 1: Cyclic Voltammetry of Ferricyanide, Laboratory Handout, Chemistry 2410L, Fall Semester
Analytical Lab 1: 2410L
Benjamin A. Battiste
Group 2
10/14/15
Introduction: The purpose of this experiment is to use cyclic voltammetry to see how ferricyanide can be reduced to ferrocyanide. Using cyclic voltammetry a calibration curve will be created to determine the concention(mM) of an unknown solution of ferricyanide. In cyclic voltammetry, the potential of a substance is scanned starting from a certain voltage, going to another voltage, and then returning to the original, hence “cyclic” voltammetry. As current changes, a triangular waveform is created which looks like an upside down V. Using this triangular waveform, a voltammogram can be made by plotting current vs. potential. A voltammogram …show more content…
Using the both the cathodic and anodic peaks plotted against concentration of ferricyanide, the equations to solve to concentrations can be calculated. According to the Randles-Sevcik equation, the R2 values for both the cathodic and anodic calibration curves should be close to 1.00 due to the linearity. While they are both close to 1.00, the cathodic value is closer. This is to be expected however, because it is the first time the solution is being scanned so it will give better and more pure results. When determining concentration of the unknown, even though they are close, if any differences arise in concentration, the concentration found using the cathodic equation should be the one …show more content…
Also, the same equipment could be used to do all measurements to ensure readings are the same. Again, these are minor details but ones that could slightly alter the results for the better if taken care of.
Conclusion: Overall I thought that the lab was a success. Our lab group decided to work together and it paid off. Everything was smooth, everyone seemed more relaxed, and it appeared that people enjoyed being there more. The lab was interesting and everyone was excited when the graphs seen on the screen looked how they should. It’s always fun getting to use new equipment in the lab. The lab is fine the way it is, it works well and if done correctly with a group can actually be fun.
References:
Experiment 1: Cyclic Voltammetry of Ferricyanide, Excel Help, Chemistry 2410L, Fall Semeter 2015
Experiment 1: Cyclic Voltammetry of Ferricyanide, Laboratory Handout, Chemistry 2410L, Fall Semester