logo

Learning objective

Calculate pH from hydrogen ion concentration.

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

Start flashcardsTry practice questionsTopic hub

At a glance

0

Flashcards

0

Questions

Topic

Acids and bases (A-level only)

Subtopic

pH and Kw (A-level only)

Aqa A Level ChemistryPhysical chemistry

Study support

Understand this objective

Quick explanation

Calculate pH from hydrogen ion concentration

  • This point belongs to Acids and bases (A-level only), especially pH and Kw (A-level only).
  • You need to be able to calculate pH from hydrogen ion concentration.
  • 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 pH of a solution with a hydrogen ion concentration of 1.0 x 10^-3 mol/dm³?

Direct answer

The pH is calculated using the formula pH = -log[H⁺]. For [H⁺] = 1.0 x 10^-3 mol/dm³, pH = -log(1.0 x 10^-3) = 3.

Key terms

  • Hydrogen ion concentration: The amount of hydrogen ions present in a solution, typically expressed in mol/dm³.
  • pH scale: A logarithmic scale used to specify the acidity or basicity of an aqueous solution, ranging from 0 (very acidic) to 14 (very basic).

Common trap

Confusing pH with hydrogen ion concentration: Remember that pH is the negative logarithm of hydrogen ion concentration; as [H⁺] increases, pH decreases.

Related questions

Try this as a practice card

3 linked

Question 1 of 3

Choose an answer, get feedback, then move sideways through the set.

0 of 1 attempted

Flashcard prompts

Flip through the key recall cards

3 cards

Flashcard 1 of 3

Press Space to flip, arrows to move

Revision tools

Choose how to practise

Back to topic hub
Flashcards0 linked cards
No objective-specific flashcards are cached for this page. Use the topic hub to revise the surrounding flashcards without triggering a frozen-subject DB fallback.Open topic hub
Practice Questions0 linked questions
No objective-specific practice questions are cached for this page. Use the topic question bank to practise nearby curriculum questions without weakening the egress guard.Open topic questions
Revision notestopic notes

Open the full topic revision notes when you are ready to review this objective in context.

Open revision notes

Related learning objectives