Thử Nghiệm Ngọn Lửa Bari

Nhận biết bari qua ngọn lửa vàng-xanh lục

Flame Tests Intermediate (High School) 20 phút ~$12,00

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

goggles gloves lab_coat

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

Bunsen burner Nichrome wire loop Watch glass Forceps

Quy trình

1

Put on nitrile gloves before handling barium chloride.

1 phút Barium compounds are toxic
2

Clean the nichrome wire by dipping in HCl and heating until no color appears.

2 phút
3

Place a small amount of barium chloride on the watch glass.

1 phút Avoid skin contact
4

Dip the clean wire into HCl, then into the barium chloride sample.

1 phút
5

Hold the wire in the Bunsen burner flame and observe the pale yellow-green color.

2 phút
6

Record the color and compare with copper (blue-green) if previously tested.

2 phút

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.

Frequently Asked Questions

What is the objective of Thử Nghiệm Ngọn Lửa Bari?
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.
How difficult is Thử Nghiệm Ngọn Lửa Bari?
This experiment is rated as Intermediate (High School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Thử Nghiệm Ngọn Lửa Bari?
Key safety precautions include: Barium chloride is toxic if ingested; Wear nitrile gloves when handling barium compounds; Wear safety goggles at all times.
What materials are needed for Thử Nghiệm Ngọn Lửa Bari?
The main materials required are: Barium chloride (BaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Thử Nghiệm Ngọn Lửa Bari?
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.