Question

I just did a lab on determination of an equilibrium constant through the reaction EtAc (aq) + H2O (sln) <-> EtOH (aq) +HAc (aq). For all initial concentrations, K was less than one. Which I know says that equilibrium favors reactants. One of the post lab questions is "Is the hypothesis that the equilibrium constant, K, really a constant not dependent on the initial concentrations correct? Explain your answer. " I am not sure how to answer this

Answer 1

No,the equilibrium constant does not depend on the initial concentrations.It only depends on thermodynamics differences between the initial and final states.The equilibrium constant does not specify concentration but only the relation between them.It depends on the nature of two state,not on how much there is.

A+B------->C+D

Kc =[C][D]/[A][B]