Identifying six solutions by their interactions 3. A student was given the follo

Question

Identifying six solutions by their interactions 3. A student was given the following five labeled solutions: NiCI, Pb(NO), NaOH, Na COa, and Cuso,. After systematically mixing the solutions in pairs, the student recorded her observations in Table 7 Table 7 Precipitate formation produced by mixing pairs of kmoon solutions solution Cuso Na C204 NaOH Ph(NO,)2 NiCl2 N.R. blue green soln. N.R. green soln. Pb(NO))2 white ppt. blue soln. white ppt. colorless soln. white ppt. colorless soln.- NaOH blue ppt. blue soln. N.R. colorless soln. Na C204 white ppt. blue soln. green ppt. green soln. N.R. green soln The student was then given the same five solutions in containers labeled A-E. After mixing these solutions in pairs, the student recorded her data in Table 8. Table 8 Precipitate formation produced by mixing pairs of unknown solutions solution N.R. colorless soln. N.R. green soln. green ppt. green soln. blue ppt. blue soln. N.R. blue-green soln. white ppt. blue soln. white ppt. blue soln. white ppt. colorless soln. N.R. green soln. white ppt. colorless soln. (1) Using the data in Tables 7 and 8, identify each of the five unknown solutions. Solution B: Solution E: Solution C Solution A: Solution D Using the information in Tables 1 and and 6, 2) Write the total equation for each reaction that produced a precipitate.

Explanation / Answer

1)solution A=NaOH solution B=NiCl2 solution E=CuSO4 D=Na2C2O4

C=Pb(NO3)2

2)complete equation-NiCl2 (aq)+2NaOH(aq)--->Ni(OH)2(s) +2NaCl(aq)

ionic eqn- Ni^2+ (aq) +2Cl^-(aq) +2 Na^+(aq) +2OH^-(aq) ----->N(OH)2(s) +2 Na+(aq) +2Cl-(aq)

net ionic eqn-   Ni^2+ (aq) +2OH^- (aq) ----->N(OH)2(s)

2) complete eqn- Pb(NO3)2(aq)+CuSO4(aq)--->PbSO4(s) +Cu(NO3)2(aq)

ionic eqn- Pb2+ (aq) + 2NO3-(aq) +Cu2+ (aq) +SO4^2- (aq) ---> PbSO4(s) +Cu2+(aq) +2NO3-(aq)

net ionic eqn- Pb2+ (aq) +SO4^2- (aq) ---> PbSO4(s)

3)complete eqn - Pb(NO3)2(aq)+Na2C2O4 (aq)--->PbC2O4 (s) + 2NaNO3(aq)

ionic eqn-Pb2+(aq)+ 2NO3-(aq) +2Na+(aq)+ C2O4^2-(aq) -----> PbC2O4 (s) + 2Na2+(aq) +2NO3-(aq)

net ionic eqn- Pb2+(aq)+ C2O4^2-(aq) -----> PbC2O4 (s)

4) Pb(NO3)2 (aq)+2NaOH(aq) --->Pb(OH)2 (s)+ 2NaNO3 (aq)

ionic eqn- Pb2+(aq)+2NO3-(aq) +2Na+(aq)+2OH-(aq)---->Pb(OH)2(s) +2Na+(aq)+2NO3-(aq)

net ionic eqn- Pb2+(aq)+2OH-(aq)---->Pb(OH)2(s)

5 )     2 NaOH+CuSO4--->Cu(OH)2(s) +Na2SO4

ionic-2Na+ + 2OH-+Cu2+ + SO4^2- --->Cu(OH)2(s) +2Na+ SO4^2-

net ionic- 2OH-+Cu2+ --->Cu(OH)2(s)

6) Na2C2O4+CuSO4---->Na2SO4 + CuC2O4(s)

ionic- 2Na+ +C2O4^2- +Cu2+ +SO4^2- ----> 2Na+ +SO4^2- +CuC2O4(s)

net ionic- C2O4^2- +Cu2+ ----> CuC2O4(s)

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