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Should We Mine This Ore?
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ore(testing a sample of ore in the actual lab) in order to extract the copper(II) ionfrom this mineral. Using different types of acids to extract this ion from themineral itself, we were testing the difference of concentration extracted using thedifferent types of acid in the lab using methods of colorimetry.In this lab, there are some specific goals in which we are to accomplish, thatare both objectives for our results and our skills. We will learn a method ofcalorimetry that will allow us to test for the concentration of the copper(II) presentin the solution. In addition to finding out the concentration, we will also be able tofind out the amount present in the solution.Procedures & MaterialMaterials:Ore(containing copper)Photospectrometer6 M Nitric acidCuvettes6 M Hydrochloric acidElectronic Balance6 M Acetic AcidGraduated Cylinder6 M AmmoniaTest TubesFor part one of the experiment, we used the reaction ofCopper(II) nitratewith ammonia hydroxide in order to produce the tetraammonium copper(II) ion.This mixture puts the concentration of the initial solution at 10 ml of 0.5M solutionand diluted the solution by half several consecutive times. The values of the diluted
concentrations in the experiment are 0.5M, 0.25M, 0.125M, 0.0635M, 0.0313M,0.0156M, 0.00781M. With these diluted solutions, we tested the absorbance of thesolutions at a wavelength of 635nm and compared them to each other by plottingthem.The second part of the lab required using the ore in the experiment. We usedfour different acids to remove the copper(II) ions from the ore. These acids werenitric acid, acetic acid, sulfuric acid, and hydrochloricacid, all at a 6 M solution.Using anywhere between .2 grams to .5 grams of the ore in a test tube, we mixed 2ml of one acid in each of the four test tubes. To separate the remaining ore from thecopper(II) ions in the acidic solution, we used a centrifuge for 3 minutes. We used1 ml of solution, not the solid pellets at the bottom of the test tube. In the new testtube with this 1 ml solution containing the copper(II) ions, we add 5 ml of