If an aqueous solution of ____ is added to a mixture of Pb2+ and Ba2+, the lead ion will precipitate, but the barium ion will remain in solution.

A. NaOH

B. Na2SO4

C. K3PO4

D. KCO3

E. Ca(CH3CO2)2

Question

If an aqueous solution of ____ is added to a mixture of Pb2+ and Ba2+, the lead ion will precipitate, but the barium ion will remain in solution.
		
A. NaOH
		
B. Na2SO4
		
C. K3PO4
		
D. KCO3
		
E. Ca(CH3CO2)2

noelgreco · Answer

You need to consult a solubility table and see which of the anions in the choices is soluble for Ba, bit insoluble for lead.

anonymous · Answer

So will the answer be B?

noelgreco · Answer

http://faculty.lacitycollege.edu/boanta/paperwork/Solubility%20Chart.pdf You'll find the answer here, but read instructions for definitions of (aq) and (s)

noelgreco · Answer

What did you get?

anonymous · Answer

I got C2H3O2-

noelgreco · Answer

The problem with acetate is that both lead acetate and barium acetate are soluble.

Go over to the OH column, and you'll see that Ba(OH)2 is soluble (aq), but Pb(OH)2 is insoluble.

You chose SO4, but it's insoluble for both Pb and Ba.

anonymous · Answer

So the only thing it can be is NaOH.

noelgreco · Answer

Yep.