When excess lead(II) nitrate was added to 225 mL of a solution of potassium iodide, a solid precipitate formed. The dry precipitate had a mass of 7.25 g. What was the concentration of iodide ions in the solution of potassium iodide? a)  0.193 mol/L   b)  0.140 mol/L   c)  0.280 mol/L   d)  0.070 mol/L   e)  0.096 mol/L

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