Thử Nghiệm Ngọn Lửa Natri
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Nhận biết natri qua ngọn lửa vàng sáng đặc trưng
Mục tiêu
Quan sát ngọn lửa vàng sáng đặc trưng sinh ra khi nung nóng các hợp chất natri, minh họa cách các ion kim loại tạo ra màu ngọn lửa đặc trưng.
Bối cảnh
The sodium flame test is one of the simplest and most dramatic qualitative analysis techniques. When sodium ions are introduced into a flame, the thermal energy excites the 3s valence electron to the 3p orbital. As the electron returns to the ground state, it emits light at 589 nm, producing an intense and persistent yellow-orange color. This is the same emission responsible for the yellow color of sodium vapor street lamps.
Cảnh báo an toàn
- Wear safety goggles at all times
- Keep hair tied back near open flames
- Handle HCl with care — avoid skin contact
- Ensure proper ventilation
PPE cần thiết
Vật liệu
-
Sodium chloride (NaCl) (1 g)Table salt works
-
Hydrochloric acid (HCl) (10 mL)1M concentration
-
Distilled water (50 mL)For cleaning
Thiết bị
Quy trình
Clean the nichrome wire by dipping it in 1M HCl and holding it in the hottest part of the Bunsen burner flame. Repeat until no color appears in the flame.
Place a small amount of sodium chloride on the watch glass.
Dip the clean nichrome wire into the HCl, then into the sodium chloride sample to pick up a small amount.
Hold the wire loop with the sample at the edge of the Bunsen burner flame and observe the flame color.
Record the flame color observed. Note the intensity and persistence of the color.
Clean the wire again with HCl and repeat to confirm results.
Kết quả dự kiến
A bright, persistent yellow-orange flame should appear immediately when the sodium chloride is introduced to the flame. The color is so intense that it can mask the colors of other metal ions present.
Dọn dẹp
Clean the nichrome wire loop thoroughly with HCl. Dispose of remaining chemicals according to lab protocols. Wipe down the work area.
Chi tiết
- Danh mục
- Flame Tests
- Độ khó
- Beginner (Middle School)
- Thời gian
- 15 phút
- Chi phí ước tính
- $5,00
- Số bước
- 6
- Vật liệu
- 3