16. 30.0 mL of a 0.100 mol/L solution of a metal ion is mixed with 30.0 mL of a 0.100 mol/L solution of a ligand L. A reaction occurs in which the product is . Approximately, what is the maximum concentration of , in mol/L, which could result from this reaction? (A) 0.0250 (B) 0.250 (C) 0.180 (D) 0.0125 (E) none of these