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 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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