Teste de Chama do Cobre

Identificação do cobre pela sua chama azul-esverdeada

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

Objetivo

Observar a característica chama azul-esverdeada produzida pelos íons de cobre(II), um dos testes de chama visualmente mais impressionantes.

Contexto

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.

Avisos de segurança

  • 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 necessário

goggles gloves lab_coat

Materiais

  • Copper(II) sulfate (CuSO₄) (1 g)
    Blue crystals
  • 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 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

Resultados esperados

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.

Limpeza

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

Detalhes

Categoria
Flame Tests
Dificuldade
Beginner (Middle School)
Duração
15 min
Custo estimado
$7,00
Passos
5
Materiais
3

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Frequently Asked Questions

What is the objective of Teste de Chama do Cobre?
Observar a característica chama azul-esverdeada produzida pelos íons de cobre(II), um dos testes de chama visualmente mais impressionantes.
How difficult is Teste de Chama do Cobre?
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 Cobre?
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 Teste de Chama do Cobre?
The main materials required are: Copper(II) sulfate (CuSO₄), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Teste de Chama do Cobre?
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.