CAIE IGCSE Chemistry: Chemical Tests for Water Question Bank
Practise water tests by choosing the correct anhydrous reagent and predicting the colour change when water is present.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- state cobalt(II) chloride changes from blue to pink when water is present
- state anhydrous copper(II) sulfate changes from white to blue with water
10.1.1—Chemical tests for the presence of question 1
[Maximum number: 2]
Cobalt and copper are transition elements.
Both copper and cobalt can form coloured compounds. Some of these compounds contain water of crystallisation.
State the colour change seen when a few drops of water are added to anhydrous copper(II) sulfate.
from to
M1 white (1)
M2 blue (1)
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