Edexcel IGCSE Chemistry 2.47 cation tests
Practise cation-test questions by adding sodium hydroxide, warming ammonium salts and comparing iron precipitate colours.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- Describe adding NaOH and warming, then testing ammonia with damp red litmus.
- Distinguish Fe2+ and Fe3+ solutions from green and brown precipitates with NaOH.
2.47 Cation tests question 1
[Maximum number: 2]
Describe a test to show that a solution contains Fe3+ ions
test
result
M1 add sodium hydroxide (solution)
M2 a brown precipitate (forms)
ACCEPT red-brown /orange-brown
M2 dependent on M1
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