Question

Which of the following equilibrium expressions corresponds to a heterogeneous equilibrium?(a) Kc =[NH4+][OH−][NH3](b) Kc =[H+][C2H3O2−][HC2H3O2](c) Kc =[Ag(NH3)2+][Cl−][NH3]2(d) Kc = [Ba2+][F−]2

Answer 1

c.
`Kc = ([Ag(NH_(3))_2^(+)][Cl^-])/([NH_3]^2)}`

d.
`Kc = [Ba^(2+)][F^(-)]^2`

Step-by-step explanation:

An heterogeneous equilibrium is defined as a system whose reactants, products, or both are in more than one phase.

Also, you must know in an equilibrium constant you don't take solids or pure liquids. Thus:

a.
`Kc = ([NH_(4)^+][OH^-])/([NH_3])}`

The reaction must be: NH₃(aq) + H₂O(l) ⇆ NH₄⁺(aq) + OH⁻(aq) All reactants are in the same phase.

b.
`Kc = ([H^+][C_2H_3O_(2)^-])/([HC_2H_3O_2])}`

The reaction must be: HC₂H₃O₂(aq) ⇄ H⁺(aq) + C₂H₃O₂⁻(aq) All reactants are in the same phase.

c.
`Kc = ([Ag(NH_(3))_2^(+)][Cl^-])/([NH_3]^2)}`

The reaction must be: 2NH₃(aq) + AgCl(s) ⇄ Ag(NH₃)₂⁺(aq) + Cl⁻(aq)

Reactants aren´t in the same phase. Heterogeneous equilibrium

d.
`Kc = [Ba^(2+)][F^(-)]^2`

The reaction must be: BaF₂(s) ⇆ Ba²⁺(aq) + 2F⁻(aq)

Reactants aren´t in the same phase. Heterogeneous equilibrium

I hope it helps!