IB Chemistry SL 3.1.8 Ph Curves Questions

Use real SL exam questions to identify or sketch strong-acid–strong-base pH curves and read the equivalence volume.

Exam points

Read a strong-acid–strong-base titration graph to state the volume added at the equivalence point.

[Maximum number: 1]

Phenylethene (styrene) is produced from ethylbenzene in a gas-phase equilibrium.

Equilibrium equation with structures: gaseous ethylbenzene, C₈H₁₀, reversibly forms gaseous styrene, C₈H₈, and hydrogen, H₂.

Benzoic acid is a weak acid. The graph shows how the pH changes during the titration of a $10.0 \mathrm{~cm}^{3}$ aqueous solution of benzoic acid with aqueous sodium hydroxide.

pH-versus-NaOH-volume curve rises gradually from about 2.8, jumps sharply near 20 cm³, then levels above pH 11.

State the volume of sodium hydroxide added at the equivalence point.

20 « $\mathrm{cm}^{3}$ »

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IB Chemistry SL 3.1.8 Ph Curves Questions question 1