A small value for K, the equilibrium constant, indicates that
Correct answer: D. The concentration of the un-ionized molecules must be relatively large compared with the ion concentrations
- A. The concentration of the un-ionized molecules must be relatively small compared with the ion concentrations
- B. The concentration of the ionized molecules must be larger than the ion concentrations
- C. The substance ionizes to a large degree
- D. The concentration of the un-ionized molecules must be relatively large compared with the ion concentrations
Explanation
For Keq to be a small value, the numerator of the expression must be small compared with the denominator. Because the numerator is the product of the concentrations of the ion concentrations and the denominator is the product of the un-ionized molecules, the concentration of the un-ionized molecules must be relatively large compared with the ion concentrations.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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