Prueba de Llama con Litio

Identificación del litio por su llama rojo carmesí

Flame Tests Beginner (Middle School) 15 min ~$8,00

Objetivo

Observar el característico color rojo carmesí de la llama producido por los iones de litio, y compararlo con otras pruebas de llama de metales alcalinos.

Antecedentes

Lithium produces a distinctive crimson-red flame when heated. The emission occurs primarily at 670.8 nm as the excited 2s electron returns to the ground state. Lithium compounds were historically used to produce red colors in fireworks before the introduction of strontium-based alternatives.

Advertencias de seguridad

  • Wear safety goggles at all times
  • Keep hair tied back near open flames
  • Handle HCl with care

EPP requerido

goggles lab_coat

Materiales

  • Lithium chloride (LiCl) (1 g)
  • 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 is visible in the flame.

2 min
2

Place a small amount of lithium chloride on the watch glass.

1 min
3

Dip the clean wire into HCl, then touch it to the lithium chloride sample.

1 min
4

Hold the wire in the Bunsen burner flame and observe the characteristic crimson-red color.

2 min Keep face away from flame
5

Record observations and compare with the sodium flame test if already performed.

1 min

Resultados esperados

A bright crimson-red flame should appear. The color is distinct from the red produced by strontium (which is more scarlet) and potassium (which is lilac/violet).

Limpieza

Clean the wire loop with HCl. Dispose of chemicals per lab protocol.

Detalles

Categoría
Flame Tests
Dificultad
Beginner (Middle School)
Duración
15 min
Costo estimado
$8,00
Pasos
5
Materiales
3

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Frequently Asked Questions

What is the objective of Prueba de Llama con Litio?
Observar el característico color rojo carmesí de la llama producido por los iones de litio, y compararlo con otras pruebas de llama de metales alcalinos.
How difficult is Prueba de Llama con Litio?
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 Litio?
Key safety precautions include: Wear safety goggles at all times; Keep hair tied back near open flames; Handle HCl with care.
What materials are needed for Prueba de Llama con Litio?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Prueba de Llama con Litio?
A bright crimson-red flame should appear. The color is distinct from the red produced by strontium (which is more scarlet) and potassium (which is lilac/violet).