Teste de Chama do Sódio

Identificação do sódio pela sua chama amarela brilhante

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

Objetivo

Observar a característica chama amarela brilhante produzida quando compostos de sódio são aquecidos, demonstrando como íons metálicos produzem cores de chama específicas.

Contexto

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.

Avisos de segurança

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

EPI necessário

goggles lab_coat

Materiais

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

Equipamentos

Bunsen burner Nichrome wire loop Watch glass Forceps

Procedimento

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 min
2

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

1 min
3

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

1 min
4

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

2 min Keep face away from flame
5

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

1 min
6

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

2 min

Resultados esperados

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.

Limpeza

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

Detalhes

Categoria
Flame Tests
Dificuldade
Beginner (Middle School)
Duração
15 min
Custo estimado
$5,00
Passos
6
Materiais
3

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Frequently Asked Questions

What is the objective of Teste de Chama do Sódio?
Observar a característica chama amarela brilhante produzida quando compostos de sódio são aquecidos, demonstrando como íons metálicos produzem cores de chama específicas.
How difficult is Teste de Chama do Sódio?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Teste de Chama do Sódio?
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 Teste de Chama do Sódio?
The main materials required are: Sodium chloride (NaCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Teste de Chama do Sódio?
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.