Barium Flame Test

Identifying barium by its yellow-green flame

Flame Tests Intermediate (High School) 20 min ~$12.00

Objective

Observe the pale yellow-green flame produced by barium ions and understand why barium compounds require extra safety precautions.

Background

Barium compounds produce a pale yellow-green (apple-green) flame when heated. The emission is primarily from BaCl molecules formed in the flame rather than from atomic barium. Barium compounds are toxic and require careful handling, but the flame test itself uses small quantities safely.

Safety Warnings

  • Barium chloride is toxic if ingested
  • Wear nitrile gloves when handling barium compounds
  • Wear safety goggles at all times
  • Wash hands thoroughly after the experiment
  • Do not eat or drink in the lab

Required PPE

goggles gloves lab_coat

Materials

  • Barium chloride (BaCl₂) (0.5 g)
    Toxic — handle with care
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

Equipment

Bunsen burner Nichrome wire loop Watch glass Forceps

Procedure

1

Put on nitrile gloves before handling barium chloride.

1 min Barium compounds are toxic
2

Clean the nichrome wire by dipping in HCl and heating until no color appears.

2 min
3

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

1 min Avoid skin contact
4

Dip the clean wire into HCl, then into the barium chloride sample.

1 min
5

Hold the wire in the Bunsen burner flame and observe the pale yellow-green color.

2 min
6

Record the color and compare with copper (blue-green) if previously tested.

2 min

Expected Results

A pale yellow-green (apple-green) flame should appear. The color is less vivid than copper's blue-green and has a distinctly yellowish tint. It may be difficult to see in a well-lit room.

Cleanup

Clean the wire with HCl. Dispose of barium waste in designated heavy metal waste container. Remove gloves carefully and wash hands thoroughly.

Details

Category
Flame Tests
Difficulty
Intermediate (High School)
Duration
20 min
Est. Cost
$12.00
Steps
6
Materials
3

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Calcium Flame Test 15 min Copper Flame Test 15 min Flame Test Comparison Lab 45 min Lithium Flame Test 15 min Potassium Flame Test 20 min Sodium Flame Test 15 min Strontium Flame Test 15 min

Frequently Asked Questions

What is the objective of Barium Flame Test?
Observe the pale yellow-green flame produced by barium ions and understand why barium compounds require extra safety precautions.
How difficult is Barium Flame Test?
This experiment is rated as Intermediate (High School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Barium Flame Test?
Key safety precautions include: Barium chloride is toxic if ingested; Wear nitrile gloves when handling barium compounds; Wear safety goggles at all times.
What materials are needed for Barium Flame Test?
The main materials required are: Barium chloride (BaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Barium Flame Test?
A pale yellow-green (apple-green) flame should appear. The color is less vivid than copper's blue-green and has a distinctly yellowish tint. It may be difficult to see in a well-lit room.