ナトリウム炎色反応

明るい黄色の炎でナトリウムを同定する

Flame Tests Beginner (Middle School) 15 分 ~$5.00

目的

ナトリウム化合物を加熱したときに生じる特徴的な明黄色の炎を観察し、金属イオンが特定の炎色を生じる仕組みを理解する。

背景

The sodium flame test is one of the simplest and most dramatic qualitative analysis techniques. When sodium ions are introduced into a flame, the thermal energy excites the 3s valence electron to the 3p orbital. As the electron returns to the ground state, it emits light at 589 nm, producing an intense and persistent yellow-orange color. This is the same emission responsible for the yellow color of sodium vapor street lamps.

安全上の警告

  • Wear safety goggles at all times
  • Keep hair tied back near open flames
  • Handle HCl with care — avoid skin contact
  • Ensure proper ventilation

必要なPPE

goggles lab_coat

材料

  • Sodium chloride (NaCl) (1 g)
    Table salt works
  • 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 it in 1M HCl and holding it in the hottest part of the Bunsen burner flame. Repeat until no color appears in the flame.

2 分
2

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

1 分
3

Dip the clean nichrome wire into the HCl, then into the sodium chloride sample to pick up a small amount.

1 分
4

Hold the wire loop with the sample at the edge of the Bunsen burner flame and observe the flame color.

2 分 Keep face away from flame
5

Record the flame color observed. Note the intensity and persistence of the color.

1 分
6

Clean the wire again with HCl and repeat to confirm results.

2 分

予想される結果

A bright, persistent yellow-orange flame should appear immediately when the sodium chloride is introduced to the flame. The color is so intense that it can mask the colors of other metal ions present.

後片付け

Clean the nichrome wire loop thoroughly with HCl. Dispose of remaining chemicals according to lab protocols. Wipe down the work area.

詳細

カテゴリ
Flame Tests
難易度
Beginner (Middle School)
所要時間
15 分
推定費用
$5.00
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 バリウム炎色反応 20 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 ナトリウム炎色反応?
ナトリウム化合物を加熱したときに生じる特徴的な明黄色の炎を観察し、金属イオンが特定の炎色を生じる仕組みを理解する。
How difficult is ナトリウム炎色反応?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for ナトリウム炎色反応?
Key safety precautions include: Wear safety goggles at all times; Keep hair tied back near open flames; Handle HCl with care — avoid skin contact.
What materials are needed for ナトリウム炎色反応?
The main materials required are: Sodium chloride (NaCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from ナトリウム炎色反応?
A bright, persistent yellow-orange flame should appear immediately when the sodium chloride is introduced to the flame. The color is so intense that it can mask the colors of other metal ions present.