Lithium Flame Test

Identifying lithium by its crimson-red flame

Flame Tests Beginner (Middle School) 15 min ~$8.00

Objective

Observe the characteristic crimson-red flame color produced by lithium ions, and compare it to other alkali metal flame tests.

Background

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.

Safety Warnings

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

Required PPE

goggles lab_coat

Materials

  • Lithium chloride (LiCl) (1 g)
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

Equipment

Bunsen burner Nichrome wire loop Watch glass Forceps

Procedure

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

Expected Results

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).

Cleanup

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

Details

Category
Flame Tests
Difficulty
Beginner (Middle School)
Duration
15 min
Est. Cost
$8.00
Steps
5
Materials
3

More Experiments

Barium Flame Test 20 min Calcium Flame Test 15 min Copper Flame Test 15 min Flame Test Comparison Lab 45 min Potassium Flame Test 20 min Sodium Flame Test 15 min Strontium Flame Test 15 min

Frequently Asked Questions

What is the objective of Lithium Flame Test?
Observe the characteristic crimson-red flame color produced by lithium ions, and compare it to other alkali metal flame tests.
How difficult is Lithium Flame Test?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Lithium Flame Test?
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 Lithium Flame Test?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Lithium Flame Test?
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).