Bariumflammtest

Barium an seiner gelbgrünen Flamme erkennen

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

Ziel

Die blassgelb-grüne Flamme von Bariumionen beobachten und verstehen, warum Bariumverbindungen besondere Sicherheitsvorkehrungen erfordern.

Hintergrund

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.

Sicherheitswarnungen

  • 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

Erforderliche PSA

goggles gloves lab_coat

Materialien

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

Ausrüstung

Bunsen burner Nichrome wire loop Watch glass Forceps

Durchführung

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.

Erwartete Ergebnisse

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.

Aufräumen

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

Details

Kategorie
Flame Tests
Schwierigkeit
Intermediate (High School)
Dauer
20 Min.
Geschätzte Kosten
$12,00
Schritte
6
Materialien
3

Weitere Experimente

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

Frequently Asked Questions

What is the objective of Bariumflammtest?
Die blassgelb-grüne Flamme von Bariumionen beobachten und verstehen, warum Bariumverbindungen besondere Sicherheitsvorkehrungen erfordern.
How difficult is Bariumflammtest?
This experiment is rated as Intermediate (High School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Bariumflammtest?
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 Bariumflammtest?
The main materials required are: Barium chloride (BaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Bariumflammtest?
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.