Chemistry

Problem

From the stability constant (hypothetical values), given below, predict which is the most stable complex ? a.

Cu^{2+} + 4NH_3 \longrightarrow [Cu(NH_3)_4]^{2+}

K = 4.5 \times 10^{11}

Cu^{2+} + 4CN^- \longrightarrow [Cu(CN)_4]^{2-}

K = 2.0 \times 10^{27}

Cu^{2+} + 2en \longrightarrow [Cu(en)_2]^{2+}

K = 3.0 \times 10^{15}

Cu^{2+} + 4H_2O \longrightarrow [Cu(H_2O)_4]^{2+}

K = 9.5 \times 10^8