What Is the Approximate Concentration of Free Cu²⁺(aq)remaining at Equilibrium

question 44

Multiple Choice

What is the approximate concentration of free Cu²⁺(aq) remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M CuCl₂(aq) with 5.0 mL of 2.0 M aqueous 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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