Three chemistry students are discussing the meaning of equilibrium constants
CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
Three chemistry students are discussing the meaning of equilibrium constants.
Student A claims, “If the equilibrium constant for a reaction is extremely large, the forward reaction must be fast.”
Student B replies, “No, a large equilibrium constant only tells us that the reaction mixture will contain almost exclusively products once equilibrium is reached.”
Student C adds, “An equilibrium constant near 1 always means the concentrations of products and reactants are exactly equal at equilibrium.”
(a) For each student’s claim (A, B, and C), indicate whether the statement is accurate or inaccurate.
(b) For every inaccurate statement, provide a clear chemical explanation that corrects the misunderstanding.
(c) For the accurate statement(s), elaborate by describing the particulate-level distribution of reactant and product species in the equilibrium mixture.
(d) Propose an experimental observation (macroscopic or spectroscopic) that could be used to support the accurate statement(s) without providing kinetic information.