Equal Volumes of 0

Multiple Choice

Equal volumes of 0.020 M Ag⁺ solution and 2.0 M NH₃ solution are mixed. Kf for [Ag(NH₃) ₂]+ is 1.6 × 107. If trisodium arsenate is added so that the arsenate ion concentration is 0.10 M, will silver arsenate precipitate? What is Q? Ksp for silver arsenate is 1.0 × 10^-22.

A) no, Q = 6.3 × 10^-9
B) no, Q = 1.9 × 10^-29
C) yes, Q = 6.5 × 10^-9
D) yes, Q = 4.2 × 10^-20
E) no, Q = 2.6 × 10^-29