Flame Tests
IGCSE Edexcel Chemistry
2.45 Flame test procedure
Key Concept:
Metal ions produce characteristic flame colors when heated in a clean flame.
Section A: Method
1. Describe the correct method for carrying out a flame test.
[4]
2. Why must the wire loop be cleaned with hydrochloric acid?
[2]
Section B: Using Results
3. What color flame suggests sodium ions?
[1]
4. A flame test gives a lilac color. Which ion is present?
[1]
Total marks: 8
Mark Scheme
1.
Clean wire, dip in HCl, heat to remove color, dip in sample, place in blue flame [4]
2.
Removes contamination so colors are accurate [2]
3.
Yellow [1]
4.
Potassium [1]