What is the approximate concentration of free Cu2+ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M CuCl2 with 5.0 mL of 2.0 M ethylenediamine? [The net formation constant for the bis(ethylenediaminecopper(II) ion is 1 × 1020.]
A) 9 × 10-22 M
B) 7 × 10-22 M
C) 2 × 10-22 M
D) 1 × 10-21 M
E) 6 × 10-22 M
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