Question

1.0 L sample of an aqueous solution contains 0.10 mol of NaCl and 0.10 mol of CaCl2. What is the minimum number of moles of AgNO3 that must be added to the solution in order to precipitate all of the Cl- as AgCl(s)

Answer 1

1.20 mol

Step-by-step explanation:

0.10 mol of NaCl contains 0.10 mol of Cl- and 0.10 mol of CaCl2 contains 0.20 mol of Cl-. So, to precipitate all of the Cl- as AgCl(s), the minimum number of moles of AgNO3 must be 0.20 mol plus 0.10 mol, which equals 1.20 mol.