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IB Chemistry HL 2.3.5 Hl Reaction Quotient Q Questions

Use real HL exam questions to calculate Q, compare it with Kc and predict whether the forward or reverse reaction is favoured.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Calculate the reaction quotient Q from non-equilibrium concentrations using the balanced-equation expression.
  • Compare Q with Kc at the same temperature to predict whether the forward or reverse reaction is favoured and the direction toward equilibrium.
  • Distinguish Q, evaluated at any composition, from Kc, defined at equilibrium, and use that distinction to explain a measured shift or yield change.

Learn this topic

Study 2.3.5 (HL)—Reaction quotient (Q) conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.3.5 Hl Reaction Quotient Q Questions question 1

[Maximum number: 1]

Nitrous acid, HNO2\mathrm{HNO}_{2}, is a weak acid which can be used to make acidic buffers.

State the correct name for the value determined in e(i).

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