IB Chemistry HL 2.3.1 Dynamic equilibrium Question Bank

Practise IB Chemistry HL 2.3.1 by applying dynamic equilibrium to exam-style questions.

[Maximum number: 3]

Nitrous acid, $\mathrm{HNO}_{2}$ , is a weak acid which can be used to make acidic buffers.

(a)

The overall reaction for the synthesis of ethyl ethanoate from ethane is:

2 \mathrm{C}_{2} \mathrm{H}_{6}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g})+\frac{3}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{2}(\mathrm{~g})+2 \mathrm{HCl}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{~g})

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(i)

The progress of the reaction was followed until equilibrium was reached.

Sketch a graph showing how the rates of the forward and reverse reactions change from the beginning of the reaction, until equilibrium has been reached.

Figure for Question (i) — IB Chemistry HL

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(b)

Suggest a reason for the difference between the value of the equilibrium constant, K, determined from experimental values in (e)(i) and the correct value calculated for K, in (d)(viii).

If you did not obtain values for these, use 7.15 for (d)(viii) and 3.75 for (e)(i), although these are not the correct values.

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2.3.1—Dynamic equilibrium question 1

Question (a)

Question (i)

Question (b)