What Is the Concentration of Free Zn²⁺ If 0

Multiple Choice

What is the concentration of free Zn²⁺ if 0.020 M Zn²+ solution is mixed with an equal volume of 2.0 M NH₃? Kf for [Zn(NH₃) ₄]²⁺ is 4.1 × 10⁸.

A) 2.5 × 10^-11
B) 2.9 × 10^-11
C) 1.7 × 10^-10
D) 9.6 × 10^-11
E) 2.4 × 10^-9