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A student was given five labeled solutions: NiCl2 , Pb(NO3)2 , NaOH , Na2C2O4 , and CuSO4 .  After mixing these solutions in pairs, the student recorded her observations on Table 3.  She was then given five labeled solutions: A, B, C, D, and E.  After mixing these solutions in pairs, the student recorded her observations on Table 4.  The one thing that she does know about these solutions is that the unknowns are the same solutions as the knowns.  So what are the five unknown solutions, i.e. list out A= , B= , C= , D= , E= . Table 3: KNOWNS XXX CuSO4 Na2C2O4 NaOH Pb(NO3)2 NiCl2 NR, blue green solution NR, green solution green ppt, green solution NR, green solution Pb(NO3)2 white ppt, blue solution white ppt, clear colorless solution white ppt, clear colorless solution XXX NaOH blue ppt, blue solution NR, clear colorless solution XXX XXX Na2C2O4 white ppt, blue solution XXX XXX XXX   Table 4:  UNKNOWNS XXX E D C B A blue ppt, blue solution white ppt, clear colorless solution NR, clear colorless solution green ppt, green solution B NR, blue green solution NR, green solution NR, green solution XXX C white ppt, blue solution white ppt, clear colorless solution XXX XXX D white ppt, blue solution XXX XXX XXX

A student was given five labeled solutions: NiCl2 , Pb(NO3)2 , NaOH , Na2C2O4 , and CuSO4 .  After mixing these solutions in pairs, the student recorded her observations on Table 3.  She was then given five labeled solutions: A, B, C, D, and E.  After mixing these solutions in pairs, the student recorded her observations on Table 4.  The one thing that she does know about these solutions is that the unknowns are the same solutions as the knowns.  So what are the five unknown solutions, i.e. list out A= , B= , C= , D= , E= . Table 3: KNOWNS XXX CuSO4 Na2C2O4 NaOH Pb(NO3)2 NiCl2 NR, blue green solution NR, green solution green ppt, green solution NR, green solution Pb(NO3)2 white ppt, blue solution white ppt, clear colorless solution white ppt, clear colorless solution XXX NaOH blue ppt, blue solution NR, clear colorless solution XXX XXX Na2C2O4 white ppt, blue solution XXX XXX XXX   Table 4:  UNKNOWNS XXX E D C B A blue ppt, blue solution white ppt, clear colorless solution NR, clear colorless solution green ppt, green solution B NR, blue green solution NR, green solution NR, green solution XXX C white ppt, blue solution white ppt, clear colorless solution XXX XXX D white ppt, blue solution XXX XXX XXX

Introductory Chemistry: A Foundation
Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter15: Solutions
Section: Chapter Questions
Problem 14ALQ
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A student was given five labeled solutions: NiCl2 , Pb(NO3)2 , NaOH , Na2C2O4 , and CuSO4 .  After mixing these solutions in pairs, the student recorded her observations on Table 3.  She was then given five labeled solutions: A, B, C, D, and E.  After mixing these solutions in pairs, the student recorded her observations on Table 4.  The one thing that she does know about these solutions is that the unknowns are the same solutions as the knowns.  So what are the five unknown solutions, i.e. list out A= , B= , C= , D= , E= .

Table 3: KNOWNS

XXX CuSO4 Na2C2O4 NaOH Pb(NO3)2
NiCl2 NR, blue green solution NR, green solution green ppt, green solution NR, green solution
Pb(NO3)2 white ppt, blue solution white ppt, clear colorless solution white ppt, clear colorless solution XXX
NaOH blue ppt, blue solution NR, clear colorless solution XXX XXX
Na2C2O4 white ppt, blue solution XXX XXX XXX

 

Table 4:  UNKNOWNS

XXX E D C B
A blue ppt, blue solution white ppt, clear colorless solution NR, clear colorless solution green ppt, green solution
B NR, blue green solution NR, green solution NR, green solution XXX
C white ppt, blue solution white ppt, clear colorless solution XXX XXX
D white ppt, blue solution XXX XXX XXX
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