Year 10 - Science
Water sample analysis: pH
Separating substances
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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 purification techniques, including filtration, crystallisation, and distillation. It explains formulations, uses chromatographic methods to identify pure and impure substances, and interprets chromatograms with Rf values. The emphasis is on accurate measurements.
Lesson Summary
You will learn to the describe how to test the pH of different water samples and suggest why they may differ in terms of dissolved substances.
Key Notes
- The pH of water samples can be determined using appropriate methods and/or instruments e.g pH meter.
- pH data can be analysed to assess if water contains impurities.
- Different substances dissolve in different types of water.
- The substances that dissolve in different waters can affect the water's acidity or alkalinity (i.e. its pH).
- Pure water is necessary for laboratory tests; it must be neutral (i.e. pH 7).
Vocabulary To Learn
- sample: A smaller portion of a larger quantity of a substance.
- dissolve: When a substance's particles separate and spread throughout the particles of a solvent resulting in it no longer being seen.
- pH: A number that shows the alkalinity or acidity of a solution.
Common Mistakes To Avoid
- All water samples are neutral (i.e. pH of 7).
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
The pH of water samples can be determined using appropriate methods and/or instruments e.g pH meter. pH data can be analysed to assess if water contains impurities.
2. Define this scientific word and use it in context. 'sample'
A smaller portion of a larger quantity of a substance. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: All water samples are neutral (i.e. pH of 7). Correction: The acidity / alkalinity of water samples is affected by the dissolved substances in each sample.
More Lessons In This Unit
- Chromatography: paper Study Guide
- Chromatography: separating a mixture of inks Study Guide
- Comparing types of chromatography: including gas chromatography Study Guide
- Crystallisation Study Guide
- Distillation: fractional distillation Study Guide
- Distillation: separating a mixture of inks Study Guide
- Distillation: simple distillation Study Guide
- Filtration Study Guide
- Interpreting chromatograms Study Guide
- Potable water Study Guide
- Potable water: including sedimentation Study Guide
- Separating mixtures Study Guide
- Separating mixtures (including formulations) Study Guide
- Solutions Study Guide
- Wastewater treatment Study Guide
- Water sample analysis: dissolved solids Study Guide
- Water sample analysis: distillation Study Guide
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