Prueba de Llama con Bario

Identificación del bario por su llama amarillo-verdosa

Flame Tests Intermediate (High School) 20 min ~$12,00

Objetivo

Observar la pálida llama amarillo-verdosa producida por los iones de bario y comprender por qué los compuestos de bario requieren precauciones de seguridad adicionales.

Antecedentes

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.

Advertencias de seguridad

  • 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

EPP requerido

goggles gloves lab_coat

Materiales

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

Equipamiento

Bunsen burner Nichrome wire loop Watch glass Forceps

Procedimiento

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

Resultados esperados

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.

Limpieza

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

Detalles

Categoría
Flame Tests
Dificultad
Intermediate (High School)
Duración
20 min
Costo estimado
$12,00
Pasos
6
Materiales
3

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Frequently Asked Questions

What is the objective of Prueba de Llama con Bario?
Observar la pálida llama amarillo-verdosa producida por los iones de bario y comprender por qué los compuestos de bario requieren precauciones de seguridad adicionales.
How difficult is Prueba de Llama con Bario?
This experiment is rated as Intermediate (High School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Prueba de Llama con Bario?
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 Prueba de Llama con Bario?
The main materials required are: Barium chloride (BaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Prueba de Llama con Bario?
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.