バリウム炎色反応

黄緑色の炎でバリウムを同定する

Flame Tests Intermediate (High School) 20 分 ~$12.00

目的

バリウムイオンが生じる淡い黄緑色の炎を観察し、バリウム化合物に特別な安全対策が必要な理由を理解する。

背景

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.

安全上の警告

  • 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

必要なPPE

goggles gloves lab_coat

材料

  • Barium chloride (BaCl₂) (0.5 g)
    Toxic — handle with care
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

器具

Bunsen burner Nichrome wire loop Watch glass Forceps

手順

1

Put on nitrile gloves before handling barium chloride.

1 分 Barium compounds are toxic
2

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

2 分
3

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

1 分 Avoid skin contact
4

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

1 分
5

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

2 分
6

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

2 分

予想される結果

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.

後片付け

Clean the wire with HCl. Dispose of barium waste in designated heavy metal waste container. Remove gloves carefully and wash hands thoroughly.

詳細

カテゴリ
Flame Tests
難易度
Intermediate (High School)
所要時間
20 分
推定費用
$12.00
ステップ数
6
材料
3

その他の実験

カリウム炎色反応 20 min カルシウム炎色反応 15 min ストロンチウム炎色反応 15 min ナトリウム炎色反応 15 min リチウム炎色反応 15 min 炎色反応比較実験 45 min 銅炎色反応 15 min

Frequently Asked Questions

What is the objective of バリウム炎色反応?
バリウムイオンが生じる淡い黄緑色の炎を観察し、バリウム化合物に特別な安全対策が必要な理由を理解する。
How difficult is バリウム炎色反応?
This experiment is rated as Intermediate (High School). It takes approximately 20 minutes to complete.
What safety precautions are needed for バリウム炎色反応?
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 バリウム炎色反応?
The main materials required are: Barium chloride (BaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from バリウム炎色反応?
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.