اختبار لهب الكالسيوم

تعرف على الكالسيوم من خلال لهبه البرتقالي الأحمر

Flame Tests Beginner (Middle School) 15 دقيقة ~$5,00

الهدف

لاحظ اللهب الأحمر الطوبي إلى البرتقالي الأحمر الناتج عن أيونات الكالسيوم، وهو عنصر شائع في الحجر الجيري والرخام والعظام.

الخلفية

Calcium produces a distinctive brick-red to orange-red flame color. The emission results from electronic transitions in calcium atoms excited by the flame energy. Calcium is one of the most abundant elements in the Earth's crust and its flame test is a useful diagnostic tool in mineral identification.

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

  • Calcium chloride (CaCl₂) (1 g)
    Common road de-icer
  • 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 appears.

2 دقيقة
2

Place calcium chloride on the watch glass and collect a sample on the clean wire.

1 دقيقة
3

Hold the wire in the Bunsen burner flame and observe the flame color.

2 دقيقة
4

Record the brick-red to orange-red color and note how it differs from strontium and lithium.

2 دقيقة

النتائج المتوقعة

A brick-red to orange-red flame should appear. The color is less vivid than strontium's scarlet and more orange than lithium's crimson. Calcium's flame is moderate in intensity.

التنظيف

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

Frequently Asked Questions

What is the objective of اختبار لهب الكالسيوم?
لاحظ اللهب الأحمر الطوبي إلى البرتقالي الأحمر الناتج عن أيونات الكالسيوم، وهو عنصر شائع في الحجر الجيري والرخام والعظام.
How difficult is اختبار لهب الكالسيوم?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for اختبار لهب الكالسيوم?
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 الكالسيوم?
The main materials required are: Calcium chloride (CaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from اختبار لهب الكالسيوم?
A brick-red to orange-red flame should appear. The color is less vivid than strontium's scarlet and more orange than lithium's crimson. Calcium's flame is moderate in intensity.