اختبار لهب الكالسيوم
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تعرف على الكالسيوم من خلال لهبه البرتقالي الأحمر
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
المواد
-
Calcium chloride (CaCl₂) (1 g)Common road de-icer
-
Hydrochloric acid (HCl) (10 mL)1M concentration
-
Distilled water (50 mL)For cleaning
المعدات
الإجراء
Clean the nichrome wire by dipping in HCl and heating until no color appears.
Place calcium chloride on the watch glass and collect a sample on the clean wire.
Hold the wire in the Bunsen burner flame and observe the flame color.
Record the brick-red to orange-red color and note how it differs from strontium and lithium.
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.
التفاصيل
- الفئة
- Flame Tests
- الصعوبة
- Beginner (Middle School)
- المدة
- 15 دقيقة
- التكلفة التقديرية
- $5,00
- الخطوات
- 4
- المواد
- 3