Unknown And Copper (Copper II) Sulfate

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Introduction: Qualitative data is information that contains no numbers, only observations; conversely, quantitative data involves the use of numbers to express what happened (cite). For the most part, this lab used quantitative data, with the exception of noting the appearance of unknown and copper(II) sulfate. There was a linear relationship between absorbance and molarity (mol/L concentration) that was used to discover the unknown compound’s identity. The unknown was identified by comparing its absorbance to the absorbance of various dilutions of copper(II) sulfate. In lab, copper(II) sulfate was used to create a control to compare an unknown. The absorbance at seven hundred (nm) for various dilutions of copper(II) sulfate was compared to the absorbance at seven hundred (nm) for the unknown substance. The unknown substance was copper(II)…show more content…
A small amount of deionized water was added and stirred. Once a solution was formed, volumetric flask was filled to 50mL using deionized water. A 2.5/10 solution was performed by adding 2.5mL of solution to a beaker followed by 7.5mL of deionized water. A 5.0/10 solution was performed by adding 5.0mL of solution to a beaker followed by 5.0mL of deionized water. A 7.5/10 solution was performed by adding 7.5mL of solution to a beaker followed by 2.5mL of deionized water. Stock solution (10mL) was measured and added to a beaker. Absorbance program was set up. The cuvettes were rinsed twice using the current tested solution. Starting with the lowest molarity solution the cuvette was filled. The filled cuvette was inserted into the machine and absorbance at 700nm was recorded. This was replicated for the 5.0/10, 7.5/10, and stock solutions. The data was inserted into excel with molarity on x-axis and absorbance on y-axis. The trend line, R2 value, and trend line equation were added to the graph. A rough sketch was added to the lab
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