1) A solution contains Pb2+ and Zn2+ ions, with nitrate as the counter ion. Consult the solubility rules to answer the following questions.
a. NaOH is added. What precipitate (or precipitates) form(s)? ______________________________
Can you distinguish between the two metal ions using sodium hydroxide? ____Yes ____No.
b. NaI is added. What precipitate (or precipitates) form(s)? ______________________________
Can you distinguish between the two metal ions using sodium iodide? ____Yes ____No
2) A test tube contains a solution with an unknown anion. Another solution of magnesium nitrate is added to the unknown, and no precipitate forms.
What anion can it be? Circle all that apply Cl� I� SO42� OH-
What anion can’t it be? Circle all that apply Cl� I� SO42� OH-
3) An unknown cation solution contains either Mg2+ or Zn2+ ions, with nitrate as a counter-ion. Using Winqual, answer the following questions about differentiating these two cations. Don�t forget � you can �right-click� on the solution to get the chemical identity of the species in the solution/solid.
Create a solution that contains Zn2+, and then add NH3 to the solution. What species forms? (circle one) [Zn(NH3)4]2+ Zn(OH)2(s)
Create a solution that contains Mg2+, and then add NH3 to the solution. What species forms? (circle one) [Mg(NH3)4]2+ Mg(OH)2(s)
c. Can you use distinguish between Zn2+ and Mg2+ ions using NH3? Yes No
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