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IB Chemistry SL 3.1.2 Conjugate Acid Base Pairs Questions

Use real SL exam questions to identify conjugate pairs and deduce conjugate acid or base formulas from proton transfer.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Identify conjugate acid–base pairs as species differing by one proton.
  • Deduce the formula or structure of the conjugate base or conjugate acid of a stated species.
  • Use proton transfer, charge and conjugate-base stability to compare acid strength or distinguish a true pair from an unrelated species relationship.

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Study 3.1.2—Conjugate acid-base pairs conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 3.1.2 Conjugate Acid Base Pairs Questions 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.

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