Year 10 - Science
Comparing concentration with strength
Making salts
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores empirical formulae, balanced chemical and ionic equations, gas identification, acid reactions, and pH as a measure of hydrogen ion concentration. It covers separation techniques and focuses on planning experiments, accurate measurements, safety, and communicating findings.
Lesson Summary
You will learn to use the pH scale to work out concentration differences between solutions relating to their pH, and discuss the differences between strong and weak acids.
Key Notes
- pH is a logarithmic scale (as hydrogen ion concentration increases by a factor of 10, the pH decreases by 1).
- For a given concentration, a stronger acid contains more H⁺ ions.
- Titration curves can be used to show the change in pH to allow chemists to pinpoint a more accurate end point.
- A strong acid is completely ionised in aqueous solution, a weak acid only partially ionises.
- Titration curves show how the pH changes throughout a neutralisation reaction.
Vocabulary To Learn
- hydrogen ion: A positively charged ion formed when a hydrogen atom loses an electron (H⁺).
- pH: The measure of the hydrogen ion (H⁺) concentration of a solution.
- concentration: The amount of solute dissolved in a certain volume of solution.
- strong acid: An acid which fully dissociates to form H⁺ ions in aqueous solution.
- weak acid: An acid which partially dissociates to form H⁺ ions in aqueous solution.
Common Mistakes To Avoid
- Pupils often confuse the chemistry meaning of strong/weak and concentrated/dilute due to the use of these words in everyday conversation.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
pH is a logarithmic scale (as hydrogen ion concentration increases by a factor of 10, the pH decreases by 1). For a given concentration, a stronger acid contains more H⁺ ions.
2. Define this scientific word and use it in context. 'hydrogen ion'
A positively charged ion formed when a hydrogen atom loses an electron (H⁺). Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils often confuse the chemistry meaning of strong/weak and concentrated/dilute due to the use of these words in everyday conversation. Correction: Clear definitions of the words are required with practice opportunities to recognise/describe whether the substances are strong or weak acids and if concentrated or dilute.
More Lessons In This Unit
- Acid-base reactions Study Guide
- Acid-base reactions (carbonates as bases) Study Guide
- Adapting a multistep chemical procedure for making a pure dry salt Study Guide
- Change in pH: practical Study Guide
- Chemical reactions of acids with metals and metal carbonates Study Guide
- Concentration of solutions Study Guide
- Concentration of solutions: using moles Study Guide
- Concentration of solutions: using moles (RAM 1 d.p.) Study Guide
- Describing salts Study Guide
- Hazard symbols and equipment Study Guide
- Ionic equations: salt formation Study Guide
- Making a pure dry sample of a soluble salt Study Guide
- pH scale and indicators Study Guide
- Solubility rules Study Guide
- Titrations: analytical technique Study Guide
- Titrations: calculating an unknown concentration Study Guide
- Titrations: calculating an unknown concentration (RAM 1 d.p.) Study Guide
- Titrations: making soluble salts Study Guide
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