Question

Identify the substances that will appear in the equilibrium constant expression for the equation: 2 upper A g superscript plus (a q) plus upper Z n (s) double arrow upper Z n superscript 2 plus (a q) plus 2 upper A g (s). Check all that apply. Ag Zn Zn2 Ag.

Answer 1

The equilibrium constant expression for the reaction 2 Ag+(aq) + Zn(s) ⇌ Zn2+(aq) + 2 Ag(s) includes only the concentrations of the aqueous ions Ag+ and Zn2+ since solid substances are omitted from this expression.

Step-by-step explanation:

The substances that will appear in the equilibrium constant (Kc) expression for the reaction 2 Ag+(aq) + Zn(s) ⇌ Zn2+(aq) + 2 Ag(s) are Ag+ and Zn2+. In an equilibrium expression, only the concentrations of the aquatic species (ions or molecules in solution) are used. Since Zn(s) and Ag(s) are in the solid state, they do not appear in the Kc expression. Thus, the equilibrium constant expression for this reaction is Kc = [Zn2+]/[Ag+]2.

It's important to remember that in the equilibrium constant expression, the concentrations of products are in the numerator and the concentrations of reactants are in the denominator, each raised to the power of their respective coefficients in the balanced chemical equation.