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IB Chemistry SL 3.1.4 Ph Scale Questions

Use real SL exam questions to calculate pH and hydrogen-ion concentration and compare acidity using pH measurements.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Calculate pH from a stated hydronium concentration using −log10[H3O+].
  • Calculate hydrogen-ion concentration from pH using [H+] = 10^−pH and compare ratios on the logarithmic scale.
  • Use pH, acid identity and an indicator or pH probe to compare acidity and report the correct units and significant figures.

Learn this topic

Study 3.1.4—pH scale conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 3.1.4 Ph Scale 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})

Calculate the concentration of H+(aq)\mathrm{H}^{+}(\mathrm{aq}) in a HClO(aq) solution with a pH=3.61.

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