اختبار لهب السترونشيوم
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تعرف على السترونشيوم من خلال لهبه الأحمر القاني
الهدف
لاحظ اللهب الأحمر القاني الساطع الناتج عن أيونات السترونشيوم، المستخدم عادةً في الألعاب النارية الحمراء والشعلات الطارئة.
الخلفية
Strontium compounds produce a vivid scarlet-red flame when heated, with primary emission lines at 460.7 nm and 707.0 nm. This distinctive red is widely used in pyrotechnics for red fireworks, road flares, and military signal flares. Strontium's flame color is more brilliant and more orange-red compared to lithium's deeper crimson.
تحذيرات السلامة
- Wear safety goggles at all times
- Keep hair tied back near open flames
- Handle HCl with care
معدات الوقاية الشخصية المطلوبة
المواد
-
Strontium chloride (SrCl₂) (1 g)
-
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 strontium chloride on the watch glass and pick up a sample on the clean wire.
Hold the wire in the Bunsen burner flame and observe the flame color.
Compare the scarlet-red color with lithium (crimson) if previously tested.
Record observations noting intensity and hue differences from other red-producing elements.
النتائج المتوقعة
A bright scarlet-red flame should appear, distinctly more orange-red than lithium's crimson. The color is vivid and persistent, easily distinguished from other metal flame colors.
التنظيف
Clean wire with HCl. Dispose of chemicals per lab protocol.
التفاصيل
- الفئة
- Flame Tests
- الصعوبة
- Beginner (Middle School)
- المدة
- 15 دقيقة
- التكلفة التقديرية
- $10,00
- الخطوات
- 5
- المواد
- 3