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Experiment #2Experiment Title: Qualitative Analysis of CationsStudent Name: Student Number: Section Number: 0116Date the experiment was performed: Jan/31st/2013Date the lab report was submitted: Feb/7th/2013Submitted to Tae Hun KimPre-lab/20Purpose/5Experimental Method/5Results and Calculations/35Accuracy/10Summary/3References/2Experimental Technique/10Report Presentation/10
Introduction:The two kinds of analysis essential to experimental chemistry are qualitative analysis andquantitative analysis. In this experiment, one will be performing standard tests for the qualitative analysis of some cations. The identification of a compound, or the components of a mixture, is known as qualitative analysis. In this experiment, one will carry out some of the standard tests for the qualitative detection of some common cations in aqueous solution.Purpose:The purpose of this experiment is to analyze and separate the cations of Fe+2, Al+3, Cu+2, and Fe+3from nitrate solutions in the known and unknown solutions. This will be accomplished by precipitating the cations in suitable insoluble solutions. The reactions involved in this experiment are:Pb2++ HCl PbCl2 (s) +H+ PbCl2 (s) + K2CrO4(aq) PbCrO4(s)+ 2KCl(aq) Cu2+(aq)+ C2H5NS (aq) CuS(aq)+ C2H5N(aq) Pb2+(aq) + C2H5NS (aq) PbS(aq) + C2H5N(aq)CuS + H+(aq) + NO3-(aq) Cu2+(aq)+ NO3-(aq) + H2S (aq)PbS + H+(aq) + NO3-(aq) Pb2+(aq)+ NO3-(aq) + H2S (aq)Cu2+(aq)+ 4NH3(aq) [Cu(NH3)4]2+ (aq) + 4H2O(l) [Cu(NH3)4]2+ (aq) + CH3CO2H(aq)Cu2+(aq) + 4NH4+(aq)Cu2+ (aq) + 4K+(aq)+ Fe(CN)64-(aq) Cu2Fe(CN)6(s) + 4K+ (aq) Fe3+ + H2O2 Fe2+ + OOH. + H+Fe3+ + NaOH Fe(OH)3 (s) Fe(OH)3 (s) + H2SO4 (aq ) Fe3+ (aq)+ SO42-(aq)+ H2OFe3+ (aq)+ SCN-(aq)FeSCN2+ (aq) Al3+ (aq)+ HNO3(aq) Al(NO3)3(aq)Al(NO3)3(aq)+ NH3(aq) Al(OH)3(s)+ 3NH4NO3
Experimental Method:Refer to CHM120 Course Manual, pages 32-34.