I think I understand the first part but need help setting up the second two ques

Question

I think I understand the first part but need help setting up the second two questions. thanks!

orm very insoluble sulfate sahs. The K for barum sufate 1.1 x 10 add sodum surate, drop-by-drap to a 8) Both Ba2 and Sr torm very The Kip rd the Ken for strontun suttane is 3 4 0-7 you soluoon that contains both 0.100 Ma+ and 0.100 M S, which akalne earth sulfe wil preciptate frst, Baso, or Srs0, (12 points total) s What wil be the suifate ion cancentration when the least sok.ble sulftate has precipitated .4 What will be the concentration of the first ion whose sultate precipitates when the second sulfate begins to precipitate?

Explanation / Answer

You already answer the two questions in the first question when you calculated the SO4 from the Ksp. From the Ksp value, the lowest value will be the one to precipitate first, while the second will precipitate last. So, all you have to do is do both equations:

BaSO4(s) ---------> Ba2+ + SO4-2
SrSO4(s) ----------> Sr2+ + SO42-

You already have the Ksp for both of them, and the concentration of Ba and Sr, so, all you have to do is calculate the concentration of SO4 from both of the equations, that will give you the concentration that it has when one or the other has precipitate.
Ksp = s2
Ksp = s*(Ba+s) Ksp is low so s will be low too, and we can neglect the sum
Ksp = s[Ba]
s = Ksp / [Ba]

Solve for s and you will have the concentrations for the ions.

Hope this helps

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