Write the concentration equilibrium constant expression for this reaction.

cu(s) + 2ag+(ag) -> cu2+(aq) + 2ag(s)

K = [Cu2^+] / [Ag^+]^2

Explanation:

The equilibrium expression written for a system in equilibrium must take into account the balanced equation for the reaction and the phases (solid, liquid, gas, or dissolved) of each species involved in the reaction.

aA + bB ⇆ cC + dD

Kc = [C]^c + [D]^d / [A]^a + [B]^b

"[ ]" - concentration of the species (moles per liter or molarity)

"a, b, c, d" - coefficients used to balance the equation

"c in Kc" - indicates that the value of K is determined using the concentrations of each species

There are two cases when a species is not shown in the equilibrium expression:  when it is a solid and when it is a pure liquid or solvent.

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