What Is the Approximate Concentration of Free Cu²⁺ Remaining at Equilibrium

question 22

Multiple Choice

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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