0.10 M potassium chromate is slowly added to a solution containing 0.50 M AgNO₃ and 0.50 M Ba(NO₃)₂.What is the Ag⁺ concentration when BaCrO₄ just starts to precipitate? The K_sp for Ag₂CrO₄ and BaCrO₄ are 1.1 × 10^-12 and 1.2 × 10^-1⁰,respectively. A) 6.5 × 10^-5 M B) 1.3 × 10^-4 M C) 3.2 × 10^-4 M D) 6.8 × 10^-2 M

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Quizplus · Accepted Answer

BaCrO₄ will precipitate first due to its lower Ksp. When BaCrO₄ starts to precipitate, the concentration of CrO₄²⁻ is determined by the Ksp of BaCrO₄. Using this concentration of CrO₄²⁻, we can calculate the concentration of Ag⁺ using the Ksp of Ag₂CrO₄.

010 M Potassium Chromate Is Slowly Added to a Solution