Lithiumflammtest

Lithium an seiner karmesinroten Flamme erkennen

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

Ziel

Die charakteristische karmesinrote Flammenfarbe von Lithiumionen beobachten und mit den Flammentests anderer Alkalimetalle vergleichen.

Hintergrund

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.

Sicherheitswarnungen

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

Erforderliche PSA

goggles lab_coat

Materialien

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

Ausrüstung

Bunsen burner Nichrome wire loop Watch glass Forceps

Durchführung

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.

Erwartete Ergebnisse

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).

Aufräumen

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

Details

Kategorie
Flame Tests
Schwierigkeit
Beginner (Middle School)
Dauer
15 Min.
Geschätzte Kosten
$8,00
Schritte
5
Materialien
3

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Bariumflammtest 20 min Calciumflammtest 15 min Kaliumflammtest 20 min Kupferflammtest 15 min Natriumflammtest 15 min Strontiumflammtest 15 min Vergleichslabor für Flammentests 45 min

Frequently Asked Questions

What is the objective of Lithiumflammtest?
Die charakteristische karmesinrote Flammenfarbe von Lithiumionen beobachten und mit den Flammentests anderer Alkalimetalle vergleichen.
How difficult is Lithiumflammtest?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Lithiumflammtest?
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 Lithiumflammtest?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Lithiumflammtest?
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).