Thử Nghiệm Ngọn Lửa Bari
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Nhận biết bari qua ngọn lửa vàng-xanh lục
Mục tiêu
Quan sát ngọn lửa vàng-xanh lục nhạt do các ion bari tạo ra và hiểu tại sao các hợp chất bari cần các biện pháp an toàn đặc biệt.
Bối cảnh
Barium compounds produce a pale yellow-green (apple-green) flame when heated. The emission is primarily from BaCl molecules formed in the flame rather than from atomic barium. Barium compounds are toxic and require careful handling, but the flame test itself uses small quantities safely.
Cảnh báo an toàn
- Barium chloride is toxic if ingested
- Wear nitrile gloves when handling barium compounds
- Wear safety goggles at all times
- Wash hands thoroughly after the experiment
- Do not eat or drink in the lab
PPE cần thiết
Vật liệu
-
Barium chloride (BaCl₂) (0.5 g)Toxic — handle with care
-
Hydrochloric acid (HCl) (10 mL)1M concentration
-
Distilled water (50 mL)For cleaning
Thiết bị
Quy trình
Put on nitrile gloves before handling barium chloride.
Clean the nichrome wire by dipping in HCl and heating until no color appears.
Place a small amount of barium chloride on the watch glass.
Dip the clean wire into HCl, then into the barium chloride sample.
Hold the wire in the Bunsen burner flame and observe the pale yellow-green color.
Record the color and compare with copper (blue-green) if previously tested.
Kết quả dự kiến
A pale yellow-green (apple-green) flame should appear. The color is less vivid than copper's blue-green and has a distinctly yellowish tint. It may be difficult to see in a well-lit room.
Dọn dẹp
Clean the wire with HCl. Dispose of barium waste in designated heavy metal waste container. Remove gloves carefully and wash hands thoroughly.
Chi tiết
- Danh mục
- Flame Tests
- Độ khó
- Intermediate (High School)
- Thời gian
- 20 phút
- Chi phí ước tính
- $12,00
- Số bước
- 6
- Vật liệu
- 3