Test de Flamme au Cuivre

Identification du cuivre par sa flamme bleu-verte

Flame Tests Beginner (Middle School) 15 min ~$7,00

Objectif

Observer la flamme bleu-verte caractéristique produite par les ions cuivre(II), l'un des tests de flamme visuellement les plus saisissants.

Contexte

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.

Avertissements de sécurité

  • 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

EPI requis

goggles gloves lab_coat

Matériaux

  • Copper(II) sulfate (CuSO₄) (1 g)
    Blue crystals
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

Équipement

Bunsen burner Nichrome wire loop Watch glass Forceps

Procédure

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

Résultats attendus

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.

Nettoyage

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

Détails

Catégorie
Flame Tests
Difficulté
Beginner (Middle School)
Durée
15 min
Coût estimé
$7,00
Étapes
5
Matériaux
3

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Frequently Asked Questions

What is the objective of Test de Flamme au Cuivre?
Observer la flamme bleu-verte caractéristique produite par les ions cuivre(II), l'un des tests de flamme visuellement les plus saisissants.
How difficult is Test de Flamme au Cuivre?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Test de Flamme au Cuivre?
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 Test de Flamme au Cuivre?
The main materials required are: Copper(II) sulfate (CuSO₄), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Test de Flamme au Cuivre?
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.