Question

Be sure to answer all parts.

A solution contains AgNO3 and Ba(NO3)2. What substance could be added to the solution to precipitate Ag+ ions, but leave Ba2+ ions in solution?

Na2SO4

NaCl

NaNO3

Na2S

After removal of the Ag+ compound, what could then be added to the solution to precipitate the Ba2+ ions?

NaCl

Na2SO4

NaNO3

Answer 1

Solution contain AgNO3 and Ba(NO3)2.

1) If we add Na2SO4, we will get precipitates of Ag2SO4 and BaSO4. Therefore, we can not separate Ag + ions and Ba 2+ ions by adding Na2SO4 .

2) If we add NaCl, we will get precipitate of AgCl only. Therefore, we can separate Ag + ions and Ba 2+ ions by adding NaCl .

3) If we add NaNO3 , we do not get any precipitate. Therefore,  NaNO3 is not useful in the separation of Ag + ions and Ba 2+ ions.

4) If we add Na2S, we will get precipitates of Ag2S and BaS. Therefore, we can not separate Ag + ions and Ba 2+ ions by adding Na2S .

ANSWER : NaCl

PART 2

After removal of Ag + ions solution contain Ba 2+ ions. We can add a reagent which can precipitate out Ba.

Out NaCl,  Na2SO4 and NaNO3 only Na2SO4 is capable of forming precipitate with Ba 2+ ions.

ANSWER : Na2SO4