IB Chemistry SL Reactivity 3.1.2 Conjugate Acid–Base Pairs

Practise finding conjugate acids and bases by adding or removing exactly one proton while updating charge correctly. Identify both pairs in a proton-transfer equation and reject…

Syllabus
First assessment 2025
Objective
3.1.2
Level
SL

Exam points

  • form a conjugate acid by adding H⁺ and a conjugate base by removing H⁺
  • verify that pair formulas differ by exactly one proton and one positive charge
  • label both acid-base conjugate pairs in a complete proton-transfer equation

3.1.2—Conjugate acid-base pairs 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})

State the formula of the conjugate base of hypochlorous acid.

All question bank results loaded