How Much Copper Is in the Coin?

We calibrated three diametric molarities of copper (II) nitrate. We tested for the %Transmittance of 1M, 0. 1M, and 0. 01M and plotted the data collected on a calibration trend based on denseness and absorbance. We apply nitrous acid to dissolve a penny to provoke another copper (II) nitrate to test its %Transmittance and plot that on the graph to discover the niggardness of that substance which came out to be about . 21M. We attempted to develop a method for determining the concentration of three different diluted copper (II) ion solutions.We also tried to determine the concentration of copper indoors a penny by dissolving it in nitric acid. We used a spectrometer to mensurate the %Transmittance of each and were able to convert it to it absorbance in order to plot it on our calibration curve. We used test tubes to contain the solution and set the spectrometers to 20, which were preset by the TA. Prepare three different beakers with i containing 0. 01M, 0. 1M, and 1M of c opper (II) nitrate ( Cu(NO3)2).Fill three different test tubes full, each having different amounts of concentrations of the copper (II) nitrate. By using the spectrometer measure the %Transmittance (%T) for each. Convert each %T into its absorbance by the equation A(absorbance)=log(100/%T) and plot on a graph. The y-axis should be labeled A and the axis should be labeled Concn for the concentration of molarity. imbibe the best fit line through the graph. Place a penny in a beaker and care in full add HNO3 and occasionally swirl so that the penny can completely dissolve.Once the penny is fully dissolved, fill another test tube with the newly created copper (II) nitrate and again, test for the %Titration and convert it to the A. fleck it on the graph on the best fit line and find the amount of concentration that was constitute within the new solution. When dissolving the penny with nitric acid make certain to perform it within the hood seeing as the gas that is created is toxic. A lso be very cautious when working with nitric acid due to the fact that is s corrosive to the skin.