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A solution contains 0.12M Ba 2+ and 0.18M Ca 2+. Sodium chromate solution is added drop by drop to slowly raise the [CrO4 2-] in the solution. a) What is the first precipitate to form? And at what [CrO4 2-] does that happen? b) If [CrO4 2-] is raised to 3.5 x 10^-3 what percentage of the original Ca 2+ will still be in solution and what percentage of the original Ba 2+ will still be in solution?