Sodium Flame Test

Identifying sodium by its bright yellow flame

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

Objective

Observe the characteristic bright yellow flame produced when sodium compounds are heated, demonstrating how metal ions produce specific flame colors.

Background

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.

Safety Warnings

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

Required PPE

goggles lab_coat

Materials

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

Equipment

Bunsen burner Nichrome wire loop Watch glass Forceps

Procedure

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

Expected Results

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.

Cleanup

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

Details

Category
Flame Tests
Difficulty
Beginner (Middle School)
Duration
15 min
Est. Cost
$5.00
Steps
6
Materials
3

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Frequently Asked Questions

What is the objective of Sodium Flame Test?
Observe the characteristic bright yellow flame produced when sodium compounds are heated, demonstrating how metal ions produce specific flame colors.
How difficult is Sodium Flame Test?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Sodium Flame Test?
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 Sodium Flame Test?
The main materials required are: Sodium chloride (NaCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Sodium Flame Test?
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.