Year 10 - Science
Titrations: calculating an unknown concentration
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 calculate the concentration of an acid using results from a neutralisation titration.
Key Notes
- Data collected during a titration allows chemists to determine a solution's unknown concentration.
- Concordant titres should be used when calculating a mean volume used to neutralise a solution.
- The coefficients in a balanced equation indicates the stoichiometry (i.e. molar ratio) between substances in a reaction.
- The concentration of an unknown solution is found using the relationship: concentration = moles ÷ volume (in dm³).
Vocabulary To Learn
- titration: A technique in volumetric analysis that is used to find the exact volumes of solutions that react with each other.
- titre: The volume of titrant needed to reach the end point in a titration.
- concordant: Readings within a certain range. For titrations, these usually need to be within 0.10 cm³ of each other.
- coefficient: The number placed in front of a chemical formula to balance an equation; it shows the ratio of substances in a reaction.
- mole: 1 mole contains 6.02 × 10²³ particles. The mass of a mole of a substance is its relative mass expressed in grams.
Common Mistakes To Avoid
- Pupils use all of their titration results to calculate an average volume used during titration. Pupils also tend to miss steps in this multi-step process.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Data collected during a titration allows chemists to determine a solution's unknown concentration. Concordant titres should be used when calculating a mean volume used to neutralise a solution.
2. Define this scientific word and use it in context. 'titration'
A technique in volumetric analysis that is used to find the exact volumes of solutions that react with each other. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils use all of their titration results to calculate an average volume used during titration. Pupils also tend to miss steps in this multi-step process. Correction: Stress the need to use concordant results when calculating an average volume for neutralising a solution via titration. Use a calculation grid to help keep each calculation step clearly organised.
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
- Comparing concentration with strength 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 (RAM 1 d.p.) Study Guide
- Titrations: making soluble salts Study Guide
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