CAIE IGCSE Chemistry 10.1.2 To test for the purity of water using
Practise purity testing by using melting and boiling points to distinguish pure water from water containing impurities.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- use a sharp boiling point of 100 °C or freezing point of 0 °C as evidence for pure water
- explain that dissolved impurities raise the boiling point above 100 °C
10.1.2—To test for the purity of water using question 1
[Maximum number: 1]
A student uses anhydrous copper(II) sulfate to test for the presence of water.
The purity of a sample of water can be assessed by measuring its boiling point.
How is the boiling point of water affected by impurities?
higher boiling point / greater than 100∘C
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