Laboratory 2: Precipitation Reactions Worksheets Name: Date: Lab Partner Tum the

Question

Laboratory 2: Precipitation Reactions Worksheets Name: Date: Lab Partner Tum these sheets into your instructor at the end of the laboratory Part B. Table 1. Results of Precipitation Reactions Pb/NO,2 BaCl Na,PO CUSO Na,CO BaCl2 Na,PO CuSO 6 10 1. Are there any reactions in which you obtained a precipitate that you predicted "no reaction" according to solubility rules? If so, list them, and provide a possible reasorn why you observed a precipitate. 2. Are there any reactions that you did not observe a solid form that you expected to? List them, and provide a possible reason why it may not have occurred.

Explanation / Answer

Pb(NO3)2(aq.) + BaCl2(aq.) = Ba(NO3)2(aq.) + PbCl2(s) (precipitate) 3Pb(NO3)2(aq.) + 2Na3PO4(aq.) = 6NaNO3(aq.) + Pb3(PO4)2(s) (precipitate) 3BaCl2(aq.) + 2Na3PO4(aq.) = 6NaCl(aq.) + Ba3(PO4)2(s) (precipitate) CuSO4(aq.) + Pb(NO3)2(aq.) = Cu(NO3)2(aq.) + PbSO4(s) (precipitate) CuSO4(aq.) + BaCl2(aq.) = CuCl2(aq.) +BaSO4(s) (white precipitate) 3CuSO4(aq.) + 2Na3PO4(aq.) = 6Na+(aq.)+ 3SO42-(aq.) + Cu3(PO4)2(s) (precipitate) Na2CO3(aq.) + Pb(NO3)2(aq.) = Na2NO3(aq.) + PbCO3(s) (white precipitate) Na2CO3(aq.) + BaCl2(aq.) = NaCl(aq.) + BaCO3(s) (precipitate) Na2CO3(aq.) + Na3PO4(aq.) = No reaction (Na has the same oxidation state in both compounds, thus replacement does not happen) Na2CO3(aq.) + CuSO4(aq.) = Na2SO4(aq.) + CuCO3(s) (precipitate) [We don't know in which of the reactions you found unexpected results. Above mentioned are the expected results of the corresponding reactions]

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