When aqueous ammonia is added to a solution that contains copper(II) sulfate

CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions

Problem

When aqueous ammonia is added to a solution that contains copper(II) sulfate, the following overall transformation occurs.

\text{Cu}^{2+}(aq)+4\,\text{NH}_3(aq)+\text{SO}_4^{2-}(aq)\rightarrow[\text{Cu}(\text{NH}_3)_4]^{2+}(aq)+\text{SO}_4^{2-}(aq)

Which ion in the equation is a spectator? (a)

\text{Cu}^{2+}

(b)

\text{SO}_4^{2-}

(c)

\text{NH}_3

(d)

[\text{Cu}(\text{NH}_3)_4]^{2+}