リチウム炎色反応

深紅色の炎でリチウムを同定する

Flame Tests Beginner (Middle School) 15 分 ~$8.00

目的

リチウムイオンが生じる特徴的な深紅色の炎色を観察し、他のアルカリ金属の炎色反応と比較する。

背景

Lithium produces a distinctive crimson-red flame when heated. The emission occurs primarily at 670.8 nm as the excited 2s electron returns to the ground state. Lithium compounds were historically used to produce red colors in fireworks before the introduction of strontium-based alternatives.

安全上の警告

  • Wear safety goggles at all times
  • Keep hair tied back near open flames
  • Handle HCl with care

必要なPPE

goggles lab_coat

材料

  • Lithium chloride (LiCl) (1 g)
  • 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

Clean the nichrome wire by dipping in HCl and heating until no color is visible in the flame.

2 分
2

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

1 分
3

Dip the clean wire into HCl, then touch it to the lithium chloride sample.

1 分
4

Hold the wire in the Bunsen burner flame and observe the characteristic crimson-red color.

2 分 Keep face away from flame
5

Record observations and compare with the sodium flame test if already performed.

1 分

予想される結果

A bright crimson-red flame should appear. The color is distinct from the red produced by strontium (which is more scarlet) and potassium (which is lilac/violet).

後片付け

Clean the wire loop with HCl. Dispose of chemicals per lab protocol.

詳細

カテゴリ
Flame Tests
難易度
Beginner (Middle School)
所要時間
15 分
推定費用
$8.00
ステップ数
5
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 バリウム炎色反応 20 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 リチウム炎色反応?
リチウムイオンが生じる特徴的な深紅色の炎色を観察し、他のアルカリ金属の炎色反応と比較する。
How difficult is リチウム炎色反応?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for リチウム炎色反応?
Key safety precautions include: Wear safety goggles at all times; Keep hair tied back near open flames; Handle HCl with care.
What materials are needed for リチウム炎色反応?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from リチウム炎色反応?
A bright crimson-red flame should appear. The color is distinct from the red produced by strontium (which is more scarlet) and potassium (which is lilac/violet).