One way to remove lead ion from water is to add a source of iodide ion so that lead iodide will precipitate out of solution:
Pb2+(aq) + 2I−(aq) → PbI2(s)
(a) What volume of a 1.0 M KI solution must be added to 120.0 mL of a solution that is 0.23 M in Pb2+ ion to precipitate all the lead ion?
L I−
(b) What mass of PbI2 should precipitate?
g PbI2
(Please show how to work it out step by step)
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