Edexcel IAL Chemistry 13.5 Catalysts and equilibrium constants

For both directly tagged tasks, state no change in the equilibrium constant and justify it through equal catalytic acceleration of the two opposing rates.

Exam points

State that a catalyst has no effect on Kc or Kp because both reaction directions speed up equally.

[Maximum number: 1]

This question is about sulfuric acid and its salts.

The manufacture of sulfuric acid involves the equilibrium

2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g}) \quad \Delta_{\mathrm{r}} H=-197 \mathrm{~kJ} \mathrm{~mol}^{-1}

A catalyst of vanadium(V) oxide is used in this reaction.

State the effect, if any, of the catalyst on the value of the equilibrium constant, $K_{p}$ .

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13.5—The value of the equilibrium constant is not affected by changes in concentration or pressure or by the addition of question 1