IB Chemistry HL 3.1.13 pH curves for weak acids/bases Question Bank

Practise IB Chemistry HL 3.1.13 by applying ph curves for weak acids/bases to exam-style questions.

Exam points

identify the relevant chemical structure, process or evidence
apply the correct chemical model or equation
evaluate the result using chemical reasoning and data

[Maximum number: 3]

When nitrogen gas and hydrogen gas are allowed to react in a closed container the following equilibrium is established.

\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) \quad \Delta H=-92.6 \mathrm{~kJ}

Sketch the pH tiration curve obtained when $50.0 \mathrm{~cm}^{3}$ of $0.100 \mathrm{moldm}^{-3} \mathrm{NH}_{3}(\mathrm{aq})$ is added to $25.0 \mathrm{~cm}^{3}$ of $0.100 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}$ (aq).

Figure for Question 3.1.13 (HL)—pH curves for weak acids/bases question 1 — IB Chemistry HL

Figure for Answer to Question 3.1.13 (HL)—pH curves for weak acids/bases question 1 — IB Chemistry HL

For volume =0: pH=1;
vertical jump should be positioned in volume range $24 \mathrm{~cm}^{3}$ to $26 \mathrm{~cm}^{3}$ and include pH range between 3 to 6;
For volume =50 : pH between 8 to 11;

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3.1.13 (HL)—pH curves for weak acids/bases question 1