Thử Nghiệm Ngọn Lửa Stronti
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Nhận biết stronti qua ngọn lửa đỏ tươi
Mục tiêu
Quan sát ngọn lửa đỏ tươi sáng do các ion stronti tạo ra, thường được sử dụng trong pháo hoa đỏ và pháo hiệu khẩn cấp.
Bối cảnh
Strontium compounds produce a vivid scarlet-red flame when heated, with primary emission lines at 460.7 nm and 707.0 nm. This distinctive red is widely used in pyrotechnics for red fireworks, road flares, and military signal flares. Strontium's flame color is more brilliant and more orange-red compared to lithium's deeper crimson.
Cảnh báo an toàn
- Wear safety goggles at all times
- Keep hair tied back near open flames
- Handle HCl with care
PPE cần thiết
Vật liệu
-
Strontium chloride (SrCl₂) (1 g)
-
Hydrochloric acid (HCl) (10 mL)1M concentration
-
Distilled water (50 mL)For cleaning
Thiết bị
Quy trình
Clean the nichrome wire by dipping in HCl and heating until no color appears.
Place strontium chloride on the watch glass and pick up a sample on the clean wire.
Hold the wire in the Bunsen burner flame and observe the flame color.
Compare the scarlet-red color with lithium (crimson) if previously tested.
Record observations noting intensity and hue differences from other red-producing elements.
Kết quả dự kiến
A bright scarlet-red flame should appear, distinctly more orange-red than lithium's crimson. The color is vivid and persistent, easily distinguished from other metal flame colors.
Dọn dẹp
Clean wire with HCl. Dispose of chemicals per lab protocol.
Chi tiết
- Danh mục
- Flame Tests
- Độ khó
- Beginner (Middle School)
- Thời gian
- 15 phút
- Chi phí ước tính
- $10,00
- Số bước
- 5
- Vật liệu
- 3