16. Consider a solution that is 0.010 M in Ba2+ and 0.020 M in Ca2+. a. If sodiu

ID: 843059 • Letter: 1

Question

16. Consider a solution that is 0.010 M in Ba2+ and 0.020 M in Ca2+.

a. If sodium sulfate is used to selectively precipitate one of the cations while leaving

the other cation in solution, which cation will precipitate first (look up the Ksp

values in your text)? What minimum concentration of Na2SO4 is required to cause

the precipitation of the cation that precipitates first?

b. What minimum concentration of Na2SO4 is required to cause the precipitation of

the cation that precipitates second?

I have no idea how to do this...Do you make 2 equations?

(A) Ba2+ will precipitate first

3.2 x 10^-11 = 0.01[SO42-]

[SO42-] =3.2 x 10^-7 M

(B) Ca2+ will precipitate first

3.2 x 10^-11 = 0.02[SO42-]

[SO42-] =1.6 x 10^-7 M

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.