IB Chemistry HL 3.1.12 Salt hydrolysis Question Bank

Practise IB Chemistry HL 3.1.12 by applying salt hydrolysis 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: 1]

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

Figure for Question 3.1.12 (HL)—Salt hydrolysis question 1 — IB Chemistry HL

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.

Explain, with reference to acid-base equilibria, why the sodium benzoate solution formed has a pH>7.

«benzoate ion» hydrolysis/reaction with water AND forms $\mathrm{OH}^{-}$ OR
$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COO}^{-}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \quad$

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3.1.12 (HL)—Salt hydrolysis question 1