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Solid Potassium Chromate (K2CrO4) Is Slowly Added to a Solution

Question 141

Multiple Choice

Solid potassium chromate (K2CrO4) is slowly added to a solution containing 0. 50 mol L-1 AgNO3 and 0. 50 mol L-1 Ba(NO3) 2. What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 × 10-12 and Solid potassium chromate (K<sub>2</sub>CrO<sub>4</sub>)  is slowly added to a solution containing 0. 50 mol L<sup>-1</sup> AgNO<sub>3</sub> and 0. 50 mol L<sup>-1</sup> Ba(NO<sub>3</sub>) <sub>2</sub>. What is the Ag<sup>+</sup> concentration when BaCrO<sub>4</sub> just starts to precipitate? The K<sub>sp</sub> for Ag<sub>2</sub>CrO<sub>4</sub> and BaCrO<sub>4</sub> are 1.1 × 10<sup>-12</sup> and   respectively. A)  6.5 × 10<sup>-5</sup> mol L<sup>-1</sup> B)  1.3 × 10<sup>-4</sup> mol L<sup>-</sup><sup>1</sup> C)  3.2 × 10<sup>-4</sup> mol L<sup>-1</sup> D)  6.8 × 10<sup>-2</sup> mol L<sup>-1</sup> respectively.


A) 6.5 × 10-5 mol L-1
B) 1.3 × 10-4 mol L-1
C) 3.2 × 10-4 mol L-1
D) 6.8 × 10-2 mol L-1

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