Prueba de Llama con Cobre

Identificación del cobre por su llama azul-verdosa

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

Objetivo

Observar la característica llama azul-verdosa producida por los iones de cobre(II), una de las pruebas de llama visualmente más llamativas.

Antecedentes

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.

Advertencias de seguridad

  • 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

EPP requerido

goggles gloves lab_coat

Materiales

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

Equipamiento

Bunsen burner Nichrome wire loop Watch glass Forceps

Procedimiento

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.

Limpieza

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

Detalles

Categoría
Flame Tests
Dificultad
Beginner (Middle School)
Duración
15 min
Costo estimado
$7,00
Pasos
5
Materiales
3

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Frequently Asked Questions

What is the objective of Prueba de Llama con Cobre?
Observar la característica llama azul-verdosa producida por los iones de cobre(II), una de las pruebas de llama visualmente más llamativas.
How difficult is Prueba de Llama con Cobre?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Prueba de Llama con 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 Prueba de Llama con Cobre?
The main materials required are: Copper(II) sulfate (CuSO₄), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Prueba de Llama con 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.