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IB Chemistry HL 3.1.1 Br Nsted Lowry Theory Questions

Use real HL exam questions to classify acids and bases, write proton-transfer equations and separate acid-base from redox behaviour.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Classify acids and bases using Brønsted–Lowry proton donation and acceptance in ionic equations.
  • Write proton-transfer equations with correct species, charges and state symbols.
  • Identify Brønsted–Lowry roles and distinguish acid–base behaviour from redox by checking proton transfer and oxidation state.

Learn this topic

Study 3.1.1—Brønsted-Lowry theory conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 3.1.1 Br Nsted Lowry Theory Questions question 1

[Maximum number: 1]

Bleaches in which chlorine is the active ingredient are the most common, although some environmental groups have concerns about their use.

In aqueous chlorine the equilibrium below produces chloric(I) acid (hypochlorous acid), HOCl , the active bleach.

Cl2(aq)+H2O(l)⇌HOCl(aq)+H+(aq)+Cl−(aq)\mathrm{Cl}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{HOCl}(\mathrm{aq})+\mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})

State a balanced equation for the reaction of chloric(I) acid with water.

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