اختبار لهب الليثيوم

تعرف على الليثيوم من خلال لهبه القرمزي الأحمر

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

الهدف

لاحظ لون اللهب القرمزي الأحمر المميز الناتج عن أيونات الليثيوم، وقارنه باختبارات لهب المعادن القلوية الأخرى.

الخلفية

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.

تحذيرات السلامة

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

معدات الوقاية الشخصية المطلوبة

goggles lab_coat

المواد

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

المعدات

Bunsen burner Nichrome wire loop Watch glass Forceps

الإجراء

1

Clean the nichrome wire by dipping in HCl and heating until no color is visible in the flame.

2 دقيقة
2

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

1 دقيقة
3

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

1 دقيقة
4

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

2 دقيقة Keep face away from flame
5

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

1 دقيقة

النتائج المتوقعة

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).

التنظيف

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

Frequently Asked Questions

What is the objective of اختبار لهب الليثيوم?
لاحظ لون اللهب القرمزي الأحمر المميز الناتج عن أيونات الليثيوم، وقارنه باختبارات لهب المعادن القلوية الأخرى.
How difficult is اختبار لهب الليثيوم?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for اختبار لهب الليثيوم?
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 اختبار لهب الليثيوم?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from اختبار لهب الليثيوم?
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).