Question

Identify the equation for which Keq = [Cu+]2[S2-].

A) CuS(s) ⇌ Cu2+(aq) + S2- (aq)

B) 1/2Cu2S(s) ⇌ Cu+(aq) + 1/2 S2- (aq)

C) Cu2S(s) ⇌ 2Cu+(aq) + S2- (aq)

D) Cu2S(s) ⇌ Cu+(aq) + 2 S2- (aq)

E) none of the answers

Answer 1

What's the problem here? Do you know the definition of Keq?

Answer 2

The "K" in Keq stands for "Constant". The "eq" means that the reaction is at equilibrium. Very roughly, Keq tells you the ratio of Products/Reactants for a given reaction at equilibrium.