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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