What Is the Approximate Concentration of Free Ni²⁺(aq)remaining at Equilibrium

question 29

Multiple Choice

What is the approximate concentration of free Ni²⁺(aq) remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl₂(aq) with 5.0 mL of 2.00 M aqeous ethylenediamine?
[The net formation constant for the tris(ethylenediaminenickel(II) ion is 2.1 × 10¹⁸.]

• A)0.050 M
• B)1.4 × 10^-19 M
• C)4.8 × 10^-19 M
• D)3.9 × 10^-20 M
• E)2.8 × 10^-20 M

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