Натриевый пламенный тест

Определение натрия по ярко-жёлтому пламени

Flame Tests Beginner (Middle School) 15 мин ~$5,00

Цель

Наблюдать характерное ярко-жёлтое пламя, возникающее при нагревании соединений натрия, и показать, как ионы металлов создают специфические цвета пламени.

Предпосылки

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.

Предупреждения по безопасности

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

Требуемые СИЗ

goggles lab_coat

Материалы

  • Sodium chloride (NaCl) (1 g)
    Table salt works
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

Оборудование

Bunsen burner Nichrome wire loop Watch glass Forceps

Процедура

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 мин
2

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

1 мин
3

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

1 мин
4

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

2 мин Keep face away from flame
5

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

1 мин
6

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

2 мин

Ожидаемые результаты

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.

Уборка

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

Детали

Категория
Flame Tests
Сложность
Beginner (Middle School)
Продолжительность
15 мин
Прим. стоимость
$5,00
Шаги
6
Материалы
3

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Frequently Asked Questions

What is the objective of Натриевый пламенный тест?
Наблюдать характерное ярко-жёлтое пламя, возникающее при нагревании соединений натрия, и показать, как ионы металлов создают специфические цвета пламени.
How difficult is Натриевый пламенный тест?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Натриевый пламенный тест?
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 Натриевый пламенный тест?
The main materials required are: Sodium chloride (NaCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Натриевый пламенный тест?
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.