Potassium chromate is slowly added to a solution containing 0.10 MAGNO, and 0.10 M Ba(NO,), What is the Ag+ concentration (in mol/L) when BaCro, just starts to precipitate? The Ka, for Ag, Cro and BaCro, are1.1 x 1012 and 1.2 × 1010, respectively. Express your answer in scientific notation rounded to three significant figures.

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