http://www.ringofblue.org/silver-double/
How do you do a double replacement net ionic equation with to different precipitates?
Products are silver(I) sulfate and barium chloride.
Ag2SO4 (s) –> 2 Ag+ (aq) + SO4^2- (aq), Ksp = 1.4 X 10^-5, which is 8.3 g Ag2SO4/liter of water.
BaSO4 (s) –> Ba^2+ (aq) + SO4^2- (aq), Ksp = 1.1 X 10^-10, which is 0.0022 g BaSO4/liter of water.
So as stated, BaSO4 is more insoluble than Ag2SO4. The products being Ag2SO4 and BaCl2 does not make any sense, since your source has to be AgCl, Ksp = 1.8 X 10^-10, which is 0.0018 g AgCl/liter of water.
So the reaction BaSO4 (s) +2 AgCl (s) –> Ag2SO4 (s) + BaCl2 (aq), the equilibrium position is on the reactant side.
So in a nutshell, it cannot be done. Now if the reaction is Ag2SO4 (s) + BaCl2 (aq) —> 2 AgCl (s) + BaSO4 (s), it can happen, the solubility of Ag2SO4 is higher than BaSO4 and that of BaCl2 (aq) is also higher than AgCl (s), so that reaction has the equilibrium position on the product side.
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