The equilibrium constant for the reaction H2 + I2 ⇌ 2HI is 50. If the volume of the container is reduced to half of its original value, the value of the equilibrium constant will be
Correct answer: B. 50
- A. 25
- B. 50
- C. 75
- D. 100
Explanation
The equilibrium constant is a "constant" for a reason-it only changes if the temperature of the reaction changes. For the reaction H2 + I2 ⇌ 2HI, reducing the volume increases the pressure and the concentration of all species equally. Since there are 2 moles of gas on both sides of the equation, the pressure change doesn't even shift the equilibrium position, and the value of KC remains exactly 50.
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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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