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Unknown Permanganate Solution Lab Report

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In this experiment, the concentration of an unknown permanganate solution will be determined. Spectroscopic techniques will be used to measure various known concentrations of permanganate solutions to create a calibration curve for the absorbance of light vs. the concentration and will be used to determine the unknown concentration1.
Introduction
In order to perform this experiment, proficiency with using spectrometers, burettes, volumetric flasks, weighing by difference, and making a hot-water bath are essential1.
By using a spectrometer’s function to analyze the absorbance of light of each of the known solutions, the resulting linear correlation will provide an equation similar to the Beer’s Law equation required for calculations1.
The linear …show more content…

Procedure
1. Obtained required materials and prepared necessary setup to complete the experiment.
2. Prepared unknown solution by using a hot-water bath to heat the 100mL volumetric flask containing 35mL of the unknown Mn2+ solution, 5mL of the provided phosphoric acid and between 0.3 to 0.5g of potassium periodate1.
3. While the unknown solution was being made, five cuvettes were prepared, one containing distilled water to calibrate the spectrometer and the other four, separately containing one of the four known permanganate solutions1.
4. After calibration, the most concentrated (known) solution was used to obtain max. The significance of this step is to set the spectrometer to measure at that particular wavelength1.
5. Manipulated with settings on the program to display a graph showing absorbance vs. concentration. Collected absorbance data for the three remaining known solutions to obtain a linear fit1.
6. Returned to the unknown cooked solution and collected absorbance data for the solution using a cuvette. Recorded results and used mathematics to ultimately determine the concentration of the unknown

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