A 1.0-L solution contains 0.1 mol KCl, 0.1 mol CaCl2, and 0.1 mol AlCl3. What is the minimum number of moles of Pb(NO3)2 that must be added to precipitate all of the Cl− ions as PbCl2?

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A 1.0-L solution contains 0.1 mol KCl, 0.1 mol CaCl2, and 0.1 mol AlCl3. What is the minimum number of moles of Pb(NO3)2 that must be added to precipitate all of the Cl− ions as PbCl2?