Teste de Chama do Lítio

Identificação do lítio pela sua chama vermelho carmesim

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

Objetivo

Observar a característica cor vermelho carmesim da chama produzida pelos íons de lítio, e compará-la com outros testes de chama de metais alcalinos.

Contexto

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.

Avisos de segurança

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

EPI necessário

goggles lab_coat

Materiais

  • Lithium chloride (LiCl) (1 g)
  • 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 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).

Limpeza

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

Detalhes

Categoria
Flame Tests
Dificuldade
Beginner (Middle School)
Duração
15 min
Custo estimado
$8,00
Passos
5
Materiais
3

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Frequently Asked Questions

What is the objective of Teste de Chama do Lítio?
Observar a característica cor vermelho carmesim da chama produzida pelos íons de lítio, e compará-la com outros testes de chama de metais alcalinos.
How difficult is Teste de Chama do Lítio?
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 Lítio?
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 Teste de Chama do Lítio?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Teste de Chama do Lítio?
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).