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Ba2+ is added to a solution to precipitate sulfate as BaSO4 (Ksp = 1.1 x 10-10)....

Ba2+ is added to a solution to precipitate sulfate as BaSO4 (Ksp = 1.1 x 10-10). a. The concentration of [Ba2+] is raised to 0.0020 M and solid BaSO4 is present in the system; calculate the equilibrium concentration of SO42-. b. Suppose KCl is added to the system to increase the ionic strength to 0.100 M; calculate the activity of the Ba2+ in this solution. c. Is equilibrium [SO42-] increased, decreased or unchanged by the addition of KCl ?

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