Copper Flame Test

Identifying copper by its blue-green flame

Flame Tests Beginner (Middle School) 15 min ~$7.00

Objective

Observe the characteristic blue-green flame produced by copper(II) ions, one of the most visually striking flame tests.

Background

Copper produces a brilliant blue-green flame due to emission from excited Cu2+ ions. When copper(II) chloride is used, the emission is enhanced because volatile CuCl molecules form in the flame, producing particularly vivid colors. The blue-green color of copper flames has been used in fireworks for centuries.

Safety Warnings

  • Wear safety goggles at all times
  • Copper compounds are toxic — do not ingest
  • Wash hands thoroughly after handling copper salts
  • Keep hair tied back near open flames

Required PPE

goggles gloves lab_coat

Materials

  • Copper(II) sulfate (CuSO₄) (1 g)
    Blue crystals
  • 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 in HCl and heating until no color appears.

2 min
2

Place a small amount of copper(II) sulfate on the watch glass.

1 min Wear gloves when handling copper salts
3

Dip the clean wire into HCl, then into the copper(II) sulfate sample.

1 min
4

Hold the wire in the Bunsen burner flame and observe the vibrant blue-green color.

2 min
5

Record the color and note any variations as the sample is consumed.

1 min

Expected Results

A vivid blue-green to green flame should appear. The color is one of the most distinctive and easily recognized of all flame tests. The flame may show different shades as the copper compound volatilizes.

Cleanup

Clean the wire with HCl. Dispose of copper compound waste in designated heavy metal waste container. Wash hands thoroughly.

Details

Category
Flame Tests
Difficulty
Beginner (Middle School)
Duration
15 min
Est. Cost
$7.00
Steps
5
Materials
3

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Frequently Asked Questions

What is the objective of Copper Flame Test?
Observe the characteristic blue-green flame produced by copper(II) ions, one of the most visually striking flame tests.
How difficult is Copper Flame Test?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Copper Flame Test?
Key safety precautions include: Wear safety goggles at all times; Copper compounds are toxic — do not ingest; Wash hands thoroughly after handling copper salts.
What materials are needed for Copper Flame Test?
The main materials required are: Copper(II) sulfate (CuSO₄), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Copper Flame Test?
A vivid blue-green to green flame should appear. The color is one of the most distinctive and easily recognized of all flame tests. The flame may show different shades as the copper compound volatilizes.