Download and practise with this ZIMSEC A-Level Chemistry Paper 2 June 2024 question paper. Useful for exam revision, past paper practice, and preparation in Zimbabwe.
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This is the ZIMSEC A-Level Chemistry question paper for Paper 2 from June 2024. Use it for exam practice under timed conditions.
2
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$\mathrm{U}_{\mathrm{se}}$
[1]
(b) The pH of 0.01 moldm ${ }^{-3}$ benzoic acid, $\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{COOH}$, is 3.09 at $25^{\circ} \mathrm{C}$.
(i) Write an equation for the dissociation of $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}$.
(ii) Calculate the acid dissociation constant of benzoic acid at $25^{\circ} \mathrm{C}$.
[4]
(c) The values of the ionic product of water, $\mathrm{K}_{\mathrm{w}}$ at different temperatures are given in Table 1.1.
\begin{table}
\captionsetup{labelformat=empty}
\caption{Table 1.1}
temperature $/{ }^{\circ} \mathrm{C}$ | $\mathrm{K}_{w} / \mathrm{mol}^{\mathbf{2}} \mathrm{dm}^{-6}$
0 | $0.10 \times 10^{-15}$
25 | $1.00 \times 10^{-14}$
50 | $5.47 \times 10^{-14}$
\end{table}
(i) Write an expression for $\mathrm{K}_{\mathrm{w}}$.
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