Thử Nghiệm Ngọn Lửa Canxi
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Nhận biết canxi qua ngọn lửa cam-đỏ
Mục tiêu
Quan sát ngọn lửa đỏ gạch đến cam-đỏ do các ion canxi tạo ra, một nguyên tố phổ biến trong đá vôi, đá cẩm thạch và xương.
Bối cảnh
Calcium produces a distinctive brick-red to orange-red flame color. The emission results from electronic transitions in calcium atoms excited by the flame energy. Calcium is one of the most abundant elements in the Earth's crust and its flame test is a useful diagnostic tool in mineral identification.
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
-
Calcium chloride (CaCl₂) (1 g)Common road de-icer
-
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 calcium chloride on the watch glass and collect a sample on the clean wire.
Hold the wire in the Bunsen burner flame and observe the flame color.
Record the brick-red to orange-red color and note how it differs from strontium and lithium.
Kết quả dự kiến
A brick-red to orange-red flame should appear. The color is less vivid than strontium's scarlet and more orange than lithium's crimson. Calcium's flame is moderate in intensity.
Dọn dẹp
Clean the 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
- $5,00
- Số bước
- 4
- Vật liệu
- 3