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IB Chemistry HL 2.3.3 Equilibrium constant (K) Question Bank

Practise IB Chemistry HL 2.3.3 by applying equilibrium constant (k) to exam-style questions.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • identify the relevant chemical structure, process or evidence
  • apply the correct chemical model or equation
  • evaluate the result using chemical reasoning and data

2.3.3—Equilibrium constant (K) question 1

[Maximum number: 2]

Consider the two equilibrium systems involving bromine gas illustrated below.

Figure for Question 2.3.3—Equilibrium constant (K) question 1 — IB Chemistry HL

Question (a)

(a)

State the effect of increasing [H2]\left[\mathrm{H}_{2}\right] in B on the value of KcK_{\mathrm{c}}.

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Question (b)

(b)

When bromine dissolves in water, 1 % of the original bromine molecules react according to the following equation.

Br2(aq)+H2O(l)⇌HOBr(aq)+HBr(aq)\mathrm{Br}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{HOBr}(\mathrm{aq})+\mathrm{HBr}(\mathrm{aq})
[ 1 ]

Question (i)

(i)

Estimate the magnitude of KcK_{\mathrm{c}} for this reaction. Choose your value from the following options:

Table for Question (i) — IB Chemistry HL
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