IB Chemistry SL Reactivity 3.1.6 Strong and Weak Acids and Bases

Practise defining strength by extent of ionisation, not by concentration. Compare equal-concentration strong and weak solutions through pH, conductivity or reaction rate, and…

Syllabus
First assessment 2025
Objective
3.1.6
Level
SL

Exam points

  • distinguish strong from weak by complete versus partial ionisation in water
  • separate acid or base strength from whether a solution is concentrated or dilute
  • explain pH, conductivity or reaction-rate differences through equilibrium ion concentrations

3.1.6—Strong vs. weak acids/bases question 1

[Maximum number: 1]

Chlorine undergoes many reactions.

Chlorine gas reacts with water to produce hypochlorous acid and hydrochloric acid.

Cl2( g)+H2O(l)⇌HClO(aq)+HCl(aq)\mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{HClO}(\mathrm{aq})+\mathrm{HCl}(\mathrm{aq})

Hypochlorous acid is considered a weak acid. Outline what is meant by the term weak acid.

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