# For a given equilibrium reaction for which K_"eq"=6.4...what scenario will alter the equilibrium value?

## $\text{i. the use of a catalyst;}$ $\text{ii. an increase in the concentration of reactants;}$ $\text{iii. the equilibrium constant will remain unchanged;}$ $\text{iv. the use of a catalyst.}$

Option $3$.
This is an easy question for someone who is informed. The equilibrium constant is CONSTANT, and does not depend on the concentrations of reactants and products. Obviously, if the concentrations of each reagent is changed, the direction of the equilibrium will move so as to satisfy the equilibrium. The equilibrium constant, however, remains constant at $6.4$.