What is constant about the equilibrium constant?

A. The reversibility of the reaction at equilibrium is constant.
B. The concentrations of products present at equilibrium are constant.
C. The concentrations of reactants present at equilibrium are constant.
D. The ratio of products to reactants at equilibrium is constant.

Question

What is constant about the equilibrium constant?

 		A.	The reversibility of the reaction at equilibrium is constant.
 		B.	The concentrations of products present at equilibrium are constant.
 		C.	The concentrations of reactants present at equilibrium are constant.
 		D.	The ratio of products to reactants at equilibrium is constant.

jfraser · Answer

The equilibrium constant is always a ratio of products/reactants.