The complexation Ni 2+ + 3 en ⇌ [Ni(en) 3 ] 2+ was studied at 25°C. The forward rate is (2.0×10 12 M -3 s -1 )[Ni 2+ ][en] 3 and the reverse rate is (4.0×10 -3 s -1 )[Ni(en) 3 2+ ]. The stability cons

Question

The complexation Ni 2+ + 3 en ⇌ [Ni(en) 3 ] 2+ was studied at 25°C. The forward rate is (2.0×10 12 M -3 s -1 )[Ni 2+ ][en] 3 and the reverse rate is (4.0×10 -3 s -1 )[Ni(en) 3 2+ ]. The stability constant of the complex is

TestHub · Accepted Answer

At equilibrium, the forward rate equals the reverse rate. The stability constant, K_stab, is given by:

K_stab = ([Ni(en)₃²⁺])/([Ni²⁺][en]³) = (k_f)/(k_b)

Given the values, we can calculate K_stab:

K_stab = (2.0 ×10¹²)/(4.0 ×10^-3) = 5.0 ×10¹⁴ M^-3

This corresponds to option (a).

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