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IB Chemistry SL 2.3.3 Equilibrium Constant K Questions

Use real SL exam questions to interpret Kc magnitude, temperature effects and reciprocal values for reversed equilibria.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Interpret Kc less than or greater than one as indicating whether reactants or products predominate and the extent of reaction.
  • Explain or determine how temperature changes the value of Kc at equilibrium.
  • Calculate the reciprocal or root-related Kc for a reversed or coefficient-scaled reaction at the same temperature.

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Study 2.3.3—Equilibrium constant (K) conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 2.3.3 Equilibrium Constant K Questions question 1

[Maximum number: 1]

The reaction between ethanoic acid and ethanol is homogeneous and reversible.

C2H6O(l)+C2H4O2(l)⇌C4H8O2(l)+H2O(l)ΔHθr=−4 kJ mol−1\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}(\mathrm{l})+\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}(\mathrm{l}) \rightleftharpoons \mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{2}(\mathrm{l})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \quad \Delta H^{\theta}{ }_{\mathrm{r}}=-4 \mathrm{~kJ} \mathrm{~mol}^{-1}

Explain the effect of reducing the temperature on the value of the equilibrium constant.

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