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EXPERIMENT 9 GROUP II CATIONS PURPOSE Numeric values are not the end all and be all of chemistry experiments Qualitative observations are equally important as indicators of chemical change and the nature of the reactants participating in a chemical reaction In this experiment the focus was on qualitative analysis of the Group II cations Cu2 Bi3 Pb2 Sn4 DePaul University 89 Through a process of rapidly spinning the solutions in a centrifuge adding different acids to the solutions and analyzing the reactions of the remaining liquids and precipitates the qualitative data in this experiment determined the presence of copper bismuth lead and tin in a known and unknown solution PROCEDURE In the previous weeks experiment the proper molarities of the necessary acids were prepared The molarities of these acids include 6 M HCl 6 M HNO3 6 M NH4OH and 6 M H2SO4 To make 30 mL of 6 M HCL 148 mL of the acid was added to 152 mL of deionized water To make 30 mL of 6 M HNO3 114 mL of the acid was added to 186 mL of deionized water To make 30 mL of 6 M NH4OH 120 mL of the acid was added to 180 mL of deionized water Finally to make 30 mL of 6 M H2SO4 993 mL of the acid was added to 2007 mL of deionized water The remainders of these acidic solutions from the previous weeks experiments were stored in the laboratory cabinets and used in this weeks experimentations Refer to Figure 91 on Page 94 of the lab manual for the experimental procedure DePaul University 94 This flowchart was followed for the known sample The flowchart was then repeated for the unknown sample Instead of using NH3 NH4OH was used Precisely fifteen drops of deionized water were added in the first step of the right-hand side of the flowchart On the left-hand side of the flowchart 00643 g of NH42SO4 were added
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