The Ksp for BaSO4 is 1.1 x 10-10 and the Ksp for BaSeO4 is 2.8 x 10-11. A 1.0 M solution of BaCl2 is slowly added to a solution of 1.0 x 10-4 M Na2SO4 and 1.0 x 10-4 M Na2SeO4. Assume no volume change. a. b. c.
Which will precipitate first? What is [Ba2+] at the first sign of precipitation? What is the concentration of the first anion when the second anion begins to precipitate?
2.
A solution of 0.10 M of Ni2+ and Cu2+ are separated using selective precipitation by the addition of solid Na2CO3. What percent of the ion that precipitates first remains in solution when the second ion begins to precipitate? Assume no volume change. Ksp NiCO3 = 1.4 x 10-7, Ksp CuCO3 = 2.5 x 10-10
3.
A dilute solution of AgNO3 is slowly added to a solution containing both Cl- and CrO42-. If the [CrO42-] is 0.010 M when the first trace of precipitate appears, what is the concentration of Cl- in solution? Assume no volume change. Ksp AgCl = 1.8 x 10-5, Ksp Ag2CrO4= 1.1 x 10-12.
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