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Learning objective

Calculate hydrogen ion concentration from pH.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Topic

Acids and bases (A-level only)

Subtopic

pH and Kw (A-level only)

Aqa A Level ChemistryPhysical chemistry

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Understand this objective

Quick explanation

Calculate hydrogen ion concentration from pH

  • This point belongs to Acids and bases (A-level only), especially pH and Kw (A-level only).
  • You need to be able to calculate hydrogen ion concentration from pH.
  • The key ideas to know are hydrogen ion concentration and pH.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

hydrogen ion concentrationpH

Why it matters

This objective helps connect pH and Kw (A-level only) to exam-style questions, flashcards, and revision notes for Acids and bases (A-level only).

Quick student answer

What is the hydrogen ion concentration of a solution with a pH of 3?

Direct answer

1.0 × 10^-3 mol/dm³

Key terms

  • Acid: A substance that donates hydrogen ions (H⁺) in a solution.
  • Base: A substance that accepts hydrogen ions (H⁺) or donates hydroxide ions (OH⁻) in a solution.

Common trap

Confusing pH with pOH: Remember that pH + pOH = 14 at 25°C, and use this relationship to find the correct values.

Related questions

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